GXemul Code2

Incorporating a patch from Brian Foley for the configure script, which checks for X11 libs in /usr/X11R6/lib64 (which is used on some Linux systems).

Attempting to begin to convert the ISA bus.

Beginning on the new interrupt subsystem.

Implementing some parts of the Dreamcast GDROM device, and various other SH4 and Dreamcast-related updates.

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Dreamcast updates.

Continuing on SH4 and Dreamcast stuff. Adding a bogus Landisk (SH4) machine mode.

CCC compiler warnings fixes

Adding a -T command line option (again?), for halting the emulator on unimplemented memory accesses.

Adding a new disk image option (-d o...) which sets the ISO9660 filesystem base offset; also making some other hacks to allow NetBSD/dreamcast and homebrew demos/games to boot directly from a filesystem image. Adding a border to the Dreamcast PVR framebuffer.