Revision history for Perl extension Algorithm::Networksort.

1.21
	Sun Sep 24 2012
	- Added color debugging code in eg/svg.pl (it lists the
	  color settings in XML comments).
	- Updated eg/text.pl to take command line options.
	- Moved graph and text option handling to their own functions,
	  graph_segment() and text_segment(), for future non-messy coding.
	Fri Sep 22 2012
	- Removed prototypes.
	- Found and removed some left-over marker code in the SVG output.
	- Moved SVG graph color code to its own function, svg_color().
	Mon Sep 10 2012
	- Modernized parts of the code -- $VERSION is now an 'our'
	  variable instead of a 'use VARS' variable, for example.
	- Added 'create_license => 1' to the Build.PL list of attributes.
	- Added 'dynamic_config => 0' to the Build.PL list of attributes.
	- Added LICENSE to the MANIFEST file.
	- Yanked an "$flag_internal" variable (and its debugging code)
	  in favor of Smart::Comments.
	- Bumped the $VERSION value up a point.
1.20
	Sun May 20 2012
	- Really bad bug introduced in version 1.08 found (text graph
	  options were checked for in the wrong hash) has been squashed.
1.10
	Wed Mar 28 2012
	- Finally organized changes (I had a hardware failure), and updated
	  the MANIFEST file to include the new JSON formatted META files.
	  Ready for release to CPAN.
	Tue Jan 31 2012
	- Perl version requirement changed to 5.8.3 (from 5.6.0). Support
	  for 5.6.0 in various perl development tools is being dropped,
	  and 5.8.3 seems to be a safe minimum, at least for the current
	  year. Change made in Build.PL and Networksort.pm.
	- Changed "repository" key in Build.PL from a hash to a string,
	  as seems to be currently required under the version of
	  Module::Build that I'm developing with (the hash form looks
	  to be for a later version that I cannot install yet).
	Tue Jan 11 2011
	- Found an error in the SYNOPSIS portion of the POD. Function
	  nw_format() had an incorrect argument.
	Thu Sep 23 2010
	- Experimented by adding a 'keywords' hash to Build.PL. We'll see if I
	  did it correctly.
	Wed Sep 15 2010
	- Update the references. Joe Celko's article in dbazine.com is gone
	  (dbazine.com seems to be under new ownership), but he used the
	  same material in the third edition of his book, so I refer to
	  that now.  Dr. Batcher's web site at Kent State has changed slightly,
	  making a change in the links necessary.
1.09	Sat May 22 2010
	- Error in POD snuck in. While I was fixing this, added some more
	  documentation on group options.
	- Added another choice for "grouping" in nw_comparators().
1.08    Mon May 17 2010
	- Added an option to nw_comparators() as a result of a communication by
	  Daniel Stutzbach. Up until now, nw_comparators simply returned the
	  comparator in the order that the algorithms created them. Daniel
	  Stutzbach pointed out that these were often not in the best order and
	  would cause a super-scalar pipeline to stall. He also pointed out that
	  just reading the list of comparators grouped for graphing removes that
	  problem (the function that arranges them for graphing, nw_group(), does
	  in fact "parallelize" the comparators so that they'll look nice on the
	  graph). So there's now an option to re-group the list. It's not the
	  default because the default behavior has been there since the beginning
	  of the module.
	  See the documentation for nw_comparator() for more information.
	- Undid use of mark attributes for SVG graphing. Too many inconsistencies
	  between different SVG viewers for me to be sure that I'm doing the right
	  thing.
	- While undoing that change, simplified the code that generates the
	  group/color attributes.  I decided that individually assigning the
	  color attribute to each element was probably a less error-prone mechanism.
	- Updated svg.pl and eps.pl in the eg directory to make use of the
	  color options.
	- Fixed the nw_group() example. It was using the default 'bosenelson'
	  algorithm, but the output was from the 'batcher' algorithm. Oops.
	- Added grouping.pl to the eg directory.
	Wed Feb 10 2010
	- Changed <svg> tag adding xmlns and viewBox attributes.
	* Change input and comparator lines to use mark attributes instead
	  of separate geometric circles.
	- Added nw_algorithms() and nw_algorithm_name() functions, and documented
	  them.
	- Updated the SVG output example and demo program in the eg directory.
1.07	Tue Feb 13 2007
	- Bowed to convention and reversed the order of the Change entries.
	- SVG-aware browsers are better at parsing, which means that my
	  output needs to be improved.  Internet Explorer 7 and Firefox
	  now parse without errors.  I am not certain that the namespace
	  option works well enough.
	- Changed the example that used the SVG output, which was based on
	  an older version of the Adobe SVG plugin, and which is not current.
	- In the interests of code clarity, made use of q and qq operators
	  instead of quotes and escaped quotes.
	- Split the test files even further.
	- SVG colors!
	- Embedded the [from, to] pairs in an xml comment before each svg
	  command to draw comparators. Debugging aid.
	- Put a group tag around the SVG commands for the input line.
1.06	Sun Jan 16 2005
	- Made some code changes to allow running this module under
	  perl 5.005.
	- Added to the SEE ALSO section a link to Joe Celko's
	  article in dbazine.com.  Bose-Nelson in SQL!
	- Updated the link to Ian Parberry's article.
	Mon Mar 21 2005
	- Removed a redundant check for an empty network in nw_format()
	  in the default format section.
	Tue May 23 2006
	- Changed arrangement of files to default layout by Module::Build.
	- Added the Meta.yml and Build.PL files.
	- Changed test files to use Test::Simple.
	Fri Jun 2 2006
	- Added pod.t.
	- Typo fix in pod (itme instead of item).  Fixed stale links.
	- It looks like the Forbes D. Lewis article, "Sorting Networks"
	  has vanished altogether.  Removed it from the See Also section.
	Wed Jul 26 2006
	- Split the batcher.t, best.t, bn.t, and hibbard.t files into
	  two.  I'm trying to  cut down the time-to-finish length, which
	  some test environments don't handle well ("Is this test done
	  yet?  I'm bored.")
	Wed Sep 13 2006
	- Added color components, although no actual colors are set yet
	  except for 'foreground'.
	- Changed the text graph option names 'fromcomp' and 'tocomp'
	  to 'compbegin' and 'compend' to make them consistant with the
	  input line names 'inputbegin' and 'inputend'.  These names
	  get adopted by the color option hash.
	Fri Sep 15 2006
	- SVG output now has colors.
1.05   Thu Jan 22 2004
	- Missing namespace in ending </g> tag for inputline definition.
	- For some reason, I took the input value for hibbard() and
	  batcher() to be the bit count, and restricted it to 32.  I
	  claim tiredness and caffeine overload.  The restriction is
	  removed, and you could have an input of 2**32 if you want,
	  although you'd be waiting a long time for a result.
	- Fixed L<> tags in the documentation.
	- In the eg directory, renamed svg.pl to svg00.pl, and added
	  svg01.pl for the XHTML version.
1.04   Sun Dec 14 2003
	- Added 'namespace' to the svg graphing options.  Added
	  it to the svg.pl script in the eg subdirectory.
1.03   Sat Dec 13 2003
	- Added 'title' to the eps and svg graphing options.
1.02  Tue Dec 9 2003
	- Little document formating errors bother me.
	- Another stupid error.  Function nw_text_graph(), used
	  by nw_graph(), was printing directly, not returning a
	  string.  It's an old function, that's how it originally
	  was designed.
	- Added the graphing options (hz_margin, indent, etc.)
	  to nw_graph().
	- Merged in the nw_group_parallel() function (moved from
	  parallel.pl in the eg subdirectory) into nw_group(),
	  fairly painlessly as it turned out.
1.01  Sat Oct 25 2003
	- Stupid error in my test scripts prevented them from
	  reading the zero_one.pl file.  Fixed.
1.00  Fri Oct 17 2003
	- Released.
0.01  Fri Jan 24 23:55:59 2003
	- original version; created by h2xs 1.21 with options
		-X -nAlgorithm::Networksort