ActiveTcl8.4.12.0.
* ext/tk/lib/tkextlib/tile/tnotebook.rb: add Tk::Tile::TNotebook#insert.
* ext/tk/sample/tkextlib/tile/demo.rb: improve the look of a part of the demo.
* ext/tk/sample/scrollframe.rb: add a new sample.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@9669 b2dd03c8-39d4-4d8f-98ff-823fe69b080e