* ext/tk/*: Support new features of Tcl/Tk8.6b1 and minor bug fixes.
( [KNOWN BUG] Ruby/Tk on Ruby 1.9 will not work on Cygwin. )
* ext/tk/*: Unify sources between Ruby 1.8 & 1.9.
Improve default_widget_set handling.
* ext/tk/*: Multi-TkInterpreter (multi-tk.rb) works on Ruby 1.8 & 1.9.
( [KNOWN BUG] On Ruby 1.8, join to a long term Thread on Tk
callbacks may freeze. On Ruby 1.9, cannot create a second
master interpreter (creating slaves are OK); supported master
interpreter is the default master interpreter only. )
* ext/tk/lib/tkextlib/*: Update supported versions of Tk extensions.
Tcllib 1.8/Tklib 0.4.1 ==> Tcllib 1.11.1/Tklib 0.5
BWidgets 1.7 ==> BWidgets 1.8
TkTable 2.9 ==> TkTable 2.10
TkTreeCtrl 2005-12-02 ==> TkTreeCtrl 2.2.9
Tile 0.8.0/8.5.1 ==> Tile 0.8.3/8.6b1
IncrTcl 2005-02-14 ==> IncrTcl 2008-12-15
TclX 2005-02-07 ==> TclX 2008-12-15
Trofs 0.4.3 ==> Trofs 0.4.4
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@24063 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
