Log Message:
atari800: updated to 3.1.0

Version 3.1.0:

General new features:
---------------------
 * More accurate emulation of PAL colours (based on analysis of oscillograms
   of real PAL GTIA output)

 * Improved PAL blending, working on all grayscale pixels and is accurate now
   (can be enabled/disabled in "TV effect" display settings)

 * common sound layer implemented (SDL, JavaNVM, OSS, DOS) with synchro sound.

 * synchronized sound is now supported by both POKEY sound engines.

 * turbo mode (F12) is considerably faster

 * Added cartridge mapping used by "Turbo Hit"/"Atari Blizzard \ 
Hit".
 * Added MegaMax 2 MB cartridge mapping.
 * Added read-only support for the 4 MB Flash MegaCart mapping.
 * Added minimal support for The!Cart.

General Fixes:
--------------
 * fixed possible unnecessary cartridge bank switching
 * fixes and clean up in Java port
 * fixed diagnostic cartridge cold start (doesn't send Start+Option)
 * fixed two old bugs in DOS sound (pitch being wrong and sound missing)
 * fixed keyboard not working for ncurses video and OSS sound