Bit 1 is always set to 1 in EFLAGS
Implremented the remaining registers <= 32-bit

Some clean-up of course was done in ther processing, but purely
cosmetic.
Added xmmword, ymmword, and some more comments
Added most 64-bit registers
Merge branch 'feature/registers' into develop
Fixed some bugs with `write()'
New unit tests for ADD and SUB
Assemly work-area for development in that area
Merge branch 'feature/asm' into develop