* ext/tk/lib/tk/variable.rb: fix namespace trouble when autoloading
* ext/tk/lib/tk/palette.rb: define Tcl variable 'tkPalette' as global
* ext/tk/lib/tk/dialog.rb: use array2tk_list method when calling
  Tk.ip_eval.
* ext/tk/lib/tk/autoload.rb: add autoload entry 'TkDialogObj' and
  'TkWarningObj'
* ext/tk/lib/tkextlib/treectrl/tktreectrl.rb: support TreeCtrl's cvs
  head.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@8239 b2dd03c8-39d4-4d8f-98ff-823fe69b080e