VBA-M public SVN build: revision 515 released

New version of the Game Boy, Game Boy Color and Game Boy Advance emulator for Windows and Linux.

Changelog:

QT:
Fixed up Qt4 project file
Started preliminary Qt4 directory dialog in options

Linux:
(new/changed functionality is mostly described in the new file doc/ReadMe.SDL.txt)
Reworked rewinds
More schemes for save/load keybindings
Savestate backups
Per-gamepad autofire (binds to a button on the real pad/keyboard)
Allow adding cheat codes from commandline
Allow adding IPS patch files from commandline
Fix bug in configuration for pad 4
Configurable default scaling of window size for openGL (when filter=0)
Assorted code cleanups (using DEFINEs instead of literals, factored-out chunks of code
from the big switch to functions, ...)
New switches for muting sound (CTRL+S), toggling cheats (CTRL-E)
Added timestamp to console messages
All messages go to console, even if they go to screen
Some messages no longer go to screen
Added new options:
Joy#_AutoA, Joy#_AutoB, openGLscale, saveKeysSwitch
Fixed maximum value for rewindTimer.

Win32/MFC
Updated about info
Added GBA_LOGGING for debug build
Added some fun.......

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