Pspzx81

This is a port of PSPZX81, the ZX81 emulator for the PSP based on xz81.

New in this version:
* Keyboard now works!  It's mapped properly to ZX81 unshifted keys, so
press shift+0 (or shift+backspace) to delete.  Check out zx81kybd.pbm
if you are not sure where keys are mapped to.

* Options re-added back from xz81: ZX80 emulation, VSYNC visuals (not
sure this is working, hardly any difference here), 1K machine and
autoload.

* Tooltypes added: ZX80, UNEXPANDED, VSYNC to enable the above options.

* User interface: ASL requesters now appear where appropriate, such as
when typing LOAD on the emulated ZX80.  F1 is load program (only works
in ZX81 mode), F9 resets the emulated machine and F10 brings up the
PSPZX81 menu.  A lot of these options do nothing, but there may be
something of use.  Clicking the window close gadget quits the emulator.
The emulation starts up immediately now rather than hopping into the
menu first.  You can set a ZX81 program file to be a project of pspzx81
and it will autoload.

* Included an AmigaGuide version of the z81 man page.  Most of this
information is still relevant and is the best documentation available.

* Moved program files out of prg directory, and various other files into
directories.

There is still a lot of PSP-specific code that needs to be removed, and
I'd like to get full-screen mode working.  However, this is mostly the
first fully working ZX81 emulator for AmigaOS4, so enjoy :)

ZX81 programs can be downloaded from
ftp://ftp.worldofspectrum.org/pub/sinclair/zx81 (also searchable
through http://www.worldofspectrum.org/infoseek.cgi)
http://www.zx-team.de/andre - lots of brand new ZX81 software