* ext/tk/tcltklib.c, ext/tk/tkutil/tkutil.c: fix memory leak.

* ext/tk/lib/tk.rb: avoid trouble when finalize TclTkIp.

* ext/tk/lib/tk.rb, ext/tk/lib/tk/*: help to fix troubles when 
  use Ttk widgets on old Tk scripts.

* ext/tk/sample/*: update and add demo stcipts. some of them are 
  introduction about new features of Tcl/Tk8.5.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@16544 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/tk/sample/demos-en/aniwave.rb

@@ -16,8 +16,10 @@ $aniwave_demo = TkToplevel.new {|w|
   positionWindow(w)
 }
 
+base_frame = TkFrame.new($aniwave_demo).pack(:fill=>:both, :expand=>true)
+
 # create label
-msg = TkLabel.new($aniwave_demo) {
+msg = TkLabel.new(base_frame) {
   font $font
   wraplength '4i'
   justify 'left'
@@ -26,7 +28,7 @@ msg = TkLabel.new($aniwave_demo) {
 msg.pack('side'=>'top')
 
 # create frame
-TkFrame.new($aniwave_demo) {|frame|
+TkFrame.new(base_frame) {|frame|
   TkButton.new(frame) {
     text 'Dismiss'
     command proc{
@@ -113,4 +115,4 @@ class AnimatedWaveDemo
 end
 
 # Start the animation processing
-AnimatedWaveDemo.new($aniwave_demo, :left).move
+AnimatedWaveDemo.new(base_frame, :left).move