Revision history for Perl Node Interface.

0.19  2011-09-xx
    - PNI::Node::some_input_slot_is_changed 
    - PNI::Node::has_no_input_slot_changed
    - PNI::Slot::In::set_data
    - PNI::Node::PNI::Root
    - some code cleaning

0.18  2011-08-23
    - PNI::GUI::Comment
    - can remove stuff with del_node, del_scenario, del_edge
    - use parent instead of use base pragma
    - use Carp in PNI::Error

0.17  2011-07-31
    - ready for first PNI::GUI::Tk usable version
    - added PNI::FAQ pod
    - scenario task calls sub scenarios task

0.16  2011-07-24
    - fixed bug on id=69733 PNI::Finder blessing
    - modularized PNI::Node::Perlvar, PNI::Node::Perlop and PNI::Node::Perlfunc
    - removed source code generation with Template toolkit
    - various improvements for PNI::GUI::Tk
    - started code cleaning

0.15  2011-06-21
    - use PNI ':-D'; # exports node, edge, ..
    - pod coverage ok
    - pod files ok
    - better code templates
    - PNI::step replaced by PNI::task
    - PNI::File, load/save scenario
    - $node->get_ordered_inputs $node->get_ordered_outputs
    - abstract views: PNI::GUI::Node, PNI::GUI::Edge, PNI::GUI::Scenario

0.14  2011-05-14
    - PNI::Node::List::Util
    - PNI::Node::Scalar::Util
    - PNI subs in lower case
    - renamed PNI::Link as PNI::Edge ... link is a reserved word so 
      if I want to export PNI subs I would have node and edge
    - PNI code uses a template system to auto generate code
    - PNI::Slot data method returns raw data
    - PNI::Slot data_ref method
    - PNI::Slot is_connected

0.12  2011-04-15
    - more Perlop nodes
    - Cwd::Getcwd, Scalar::Util::Looks_like_number, List::Util::Max nodes
    - every node has a test
    - code generation with Template Toolkit
    - PNI::RUN renamed in PNI::step
    - PNI synopsis test

0.11  2011-03-19
    - added PNI::Error
    - perlcritic ok
    - PNI::Node::Tk 0.11
    - abstract gui and scenario model
    - scenario items: node and link

0.1   2011-02-01
    - interface restiling and cleanup
    - test driven development philosophy, every node has a test
    - base class PNI::Item

0.05  2010-06-26
    - fixed failing tests
    - more nodes and tests
    - added blog at http://perl-node-interface.blogspot.com/

0.03  2010-05-31
    - some bug fixing
    - backported from perl 5.10 to 5.8.8

0.02  2010-05-12
    - fixed problem about loading nodes
    - added Perlop::Eq node

0.01  2010-05-07
    - first minimal release: just works as cpan module :)