Go4Go SGF Replayer

Further performance improvement by improving the algorithm to check the dead stones on board.
'Paste SGF from Clipboard' function added.
Imporved parser which handles SGF content with extra text (such as email header). This, when combined with the 'Paste SGF from Clipboard' function, provides a very convenient way for users to replay games found from the Internet.
SGF parser now can handle a common mistake in SGF files: move at the first node.
Fixed a few SGF tree displaying and selection issues under Motif look and feel. Linux users no longer have an invalid Windows Look and Feel option.

Major performance improvement of the board painting code. Users on slow computers should really feel the difference. My development computer is a 2.4GHz laptop. I did not realize the performance issue until I tested on an old 400MHz computer.
Much better support of Go problems written in SGF format.
Fixed various board painting problems when drawing labels.
Move numbers and board markups no longer overlap.

Now a game description is displayed as window title when a SGF file is opened.
When loading big SGF files, change the cursor to 'busy' and block user input.
Bug fix: when switching SGF files, the commentary area is now properly reset.
Now user is able to switch the look and feel of this application.
Highlight effect of the stones is added. An option menu item is added to turn on/off this effect.

Improved SGF parser that is faster and handles bad-formed SGF files better.
Better error handling. Users will be informed if they are opening a SGF file that can not be read.
Correct minor board painting issues when the main window is resized.