- Add the THANKS file to the Mac OS X application
* modules/gui/macosx/about.?:
  - Use c-style comments instead of //
  - Open the AUTHORS file with the correct Encoding
  - Display the THANKS file as well
  - Rotate the scrolling when at the end
* modules/gui/macosx/intf.m:
  - put Cocoa into multithreaded mode as soon as possible. Not really
    causing any problems now, but is cleaner.
* modules/gui/macosx/prefs.m:
  - Select the current setting when we create a combobox.