GXemul Code2

Fixing some more floating point bugs.

Beginning on test/floatingpoint infrastructure.

Spelling.

Fixing an old very annoying bug where floating point number 0x0 was interpreted as 2.22507e-308 rather than 0.0. Thanks to Maya Rashish (coypu@...) for reproting the bug.

Moving the Memory Transfer Engine code into a separate function as well.

Moving the primitive drawing code to a separate function.

Getting rid of a hack in the O2 rendering code for "stipple patterns", by looking at the "stipple mode" register.

Updating the TODO.

Updating the TODO.

Removing the note regarding the "new" framework from the README.