Initial changes

Added remaining two MMU commands
Changed padimage to give help text when no file is provided
Updated .gitignore to ignore common clutter
Added link to emulator in README
Upstream updates

Pulled in 2.13.3 upstream files
Added *.o to .gitignore
Updated rpc8e.lib
More changes

Rolled back .gitignore
Updated rpc8e.lib
More cleanup

Fixed __STACKSIZE__ def for test target in root makefile
Removed unnecessary/broken conditional for cleaning upstream obj files
Temporarily added kbhit() def to test so it will build
Re-added ending newline to .gitignore
Modified test.c comment
Removed binary files
More changes

Changed padimage to return 1 with no file arg
Added preliminary I/O expander test file
Exit early if we couldn't allocate a buffer.
util/ changes

Added util/bin2h.c, which converts files to populated C arrays
Modified padimage to be more fault-tolerant
Fixed typo made in last commit
More changes to I/O test file
Initial checkin of DI code, probably doesn't work yet.
More DI changes; it still doesn't work yet
More DI changes; MAY work now
Commited working changes to DI, will port to cc65's dio next
Added initial DIO support, DIO test program
Updated Makefile with test suite target
Fixed test suite entry