* ext/tk/lib/tk.rb: ditto.
* ext/tk/extconf.rb: ditto.
* ext/tk/lib/tk_mac.rb: add new features of Tcl/Tk8.6.
* ext/tk/lib/tkextlib/tile/treeview.rb: ditto.
* ext/tk/lib/tkextlib/tile/fontchooser.rb: add an alias.
* ext/tk/lib/tk/autoload.rb: ditto.
* ext/tk/lib/tkextlib/tcllib/validator.rb: add a new feature of tklib extension.
* ext/tk/lib/tkextlib/tkimg/dted.rb: a new supported format of Img extension.
* ext/tk/lib/tkextlib/tkimg/raw.rb: ditto.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48018 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
