* ext/tcltklib/tcltklib.c: add nativethread consistency check.
* ext/tcltklib/stubs.c: ditto.
* ext/tk/lib/tk.rb: forgot to define TclTkIp.encoding and encoding=
  when Tcl is 7.6 or 8.0.
* ext/tk/lib/tk/wm.rb: support to make some methods as options of
  root or toplevel widget. [ruby-talk:150336]
* ext/tk/lib/tk/root.rb: ditto.
* ext/tk/lib/tk/toplevel.rb: ditto.
* ext/tk/lib/tkextlib/SUPPRT_STATUS: update RELEASE_DATE


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@8910 b2dd03c8-39d4-4d8f-98ff-823fe69b080e