[PD] [GEM] new OSX binaries

[chris clepper]

I made some of the changes discussed earlier this week to the OSX 
version of GEM.

changes:

- [gemwin] now has a [secondscreen( message that toggles the use of a 
second display on and off.

- [dimen x y( works for secondscreen.  the default is 640x480.  if 
the dimen is not supported by the display the context is not created. 
untested with PAL equipment, but should work.

- [pix_videoDarwin] and [yuv_videoDarwin] have a [quality $1( 
message.  Mainly useful for DV devices using [quality 1( to insure 
HighQuality.

Both the Experimental and G4 versions have these changes.

Available at http://taproot.dyndns.org/~cgc/

cgc