GP2XMESS v0.13

* Fix memory leak in vkeyb. This was causing crash
after having virtual keyboard up for a certain amount
of time (and pressing buttons). This did not show
up on my desktop because I have a lot more memory.

gp2x/gp2x_sdl.c

* Cleanup in vkeyb

gp2x/gp2x_vkeyb.[c/h]
gp2x/gp2x_joy.c
gp2x/gp2x_vid.c

* Put most used instructions at top of switch/case.

src/cpu/hd6309/hd6309.c (xmess)

* Removed some division from coco driver

mess/vidhrdw/dragon.c (xmess)

* Added keycode shortcuts to cfg files for coleco and a7800.

For coleco:
The 'Start' key will press '1' in addition to it being
usable via the virtual keyboard.

For a7800:
The 'Select' key maps to the Select key on the Atari 7800

cfg/coleco.cfg
cfg/a7800.cfg

* Added support for paging in initial file dialog.
Left and Right joystick go up and down respectively.

gp2x/gp2x_fs_dlg.c

* Changed more / to >> in functions used by apple2
driver according to gprof.

src/tilemap.c (xmess)

* Changed / 8 to >> in hires memory reads, also
removed all notions of parallel processing which
was not utilized. Nice speed up!

mess/vidhrdw/apple2.c (xmess)

* Fixed bug in virtual keyboard when run on __GP2X_HOST__

gp2x/gp2x_vkeyb.c

* Added some error handling to font rendering. Also
added workaround for current TTF bug on Debian.

gp2x/gp2x_sdl.c
gp2x/gp2x_sysdep_keyb.c

* Gutted out Mockingboard support. This was chewing up
a large portion of the CPU when running. Not sure
how to handle it for those who would like it. Most
stuff runs at around 72% now w/ default FS, it was
in the low 50s.

mess/systems/apple2.c (xmess)