Minor UI error from removal of OpenGL button
Removed any OpenGL stuff
When using CGIMAGEREF drawing strategy, allow any bit depth
32bit defaults for windowed mode.
[[blah alloc] init] -> [blah new], error checking when deleting volume files
Debug statements were not in D() macros
A better screens prefs change
Fix for screen radio-button selection bug, general tidyup.
Initial revision of Mac OS X port code. Uses Objective-C++. Needs Mac OS 10.1
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