* ext/tk/lib/tk/itemconfig.rb: ditto.

* ext/tk/sample/ttk_wrapper.rb: bug fix.

* ext/tk/sample/tktextio.rb: add binding for 'Ctrl-u' at console mode.

* ext/tk/lib/tk.rb, ext/tk/lib/tk/itemfont.rb, ext/tk/lib/font.rb: 
  support __IGNORE_UNKNOWN_CONFIGURE_OPTION__ about font options.

* ext/tk/lib/tkextlib/iwidgets/scrolledcanvas.rb, 
  ext/tk/lib/tkextlib/iwidgets/scrolledlistbox.rb, 
  ext/tk/lib/tkextlib/iwidgets/scrolledtext.rb: bug fix. 

* ext/tk/lib/tkextlib/tile/tpaned.rb: improve TPaned#add.

* ext/tk/lib/tk/timer.rb: add TkTimer#at_end(proc) to register the 
  procedure which called at end of the timer.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@16020 b2dd03c8-39d4-4d8f-98ff-823fe69b080e