* multi-tk.rb, tk.rb, tkafter.rb, tkcanvas.rb, tkfont.rb, tktext.rb,
  tkvirtevent.rb : Ruby/Tk works at $SAFE == 4


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@4527 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

* add Tk::Encoding.{encoding_convertfrom, encoding_convertto}
* add TkOptionDB.read_with_encoding to read non-utf8 resource file


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@4250 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

  * TkToplevel, TkFrame, TkPanedwindow, TkOptionDB : bug fix
  * TkOptionDB : make it more secure to use procs defined on resourceDB

sample/tkoptdb.rb, sample/resource.ja, sample/resource.en :
  * sample script how to use TkOptionDB.
    resource.ja and resource.en are samples of resource definition file
    which are read by tkoptdb.rb.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@3998 b2dd03c8-39d4-4d8f-98ff-823fe69b080e