Revision history for Perl extension Tk::HListbox.

1.0    Mon May 25, 2015
	- original version; Derived from Tk::HList and Tk::Listbox, 
	  created by h2xs 1.23 with options -X -n Tk::HListbox
2.0
	- Massive cleanup of bindings to make work more exactly like Tk::Listbox.
	  * Added Tk::Listbox's -listvariable option and bbox() function.
	  This is implemented using the existing TIE @array feature.
	  Tk::HListbox previously used Tk::HList's "anchor" as it's "active" 
	  indicator since Tk::HList does not have the concept of an "active" 
	  entry, but now we use a hidden "virtual anchor" variable allowing 
	  us to maintain a proper select anchor while still using Tk::HList's 
	  anchor as the "active" cursor.
	  * Added Tk::HList's hide() and show() functions and -command callback.
	  * Added an image-only option (-itemtype => 'image').
	  * Found and fixed numerous little issues and descrepencies.
	  It should now be possible to use Tk::HListbox as a complete drop-
	  in replacement for Tk::Listbox in existing code while simply adding 
	  any additional Tk::HListbox features, such as images, indicators, 
	  and callbacks as needed.
2.1
	- * Added "-state" to the list of dynamically-configurable options, ie. 
	  developers can now do "$lb->configure(-state => <state>);" and have 
	  it work.
	  * Fixed get() function to work like Tk::Listbox->get() and FAIL if 
	  no arguments (indices) given.