Added cmpne/cpxne (cbeq/cbeqa/cbeqx) instruction and cleaned up
Added cmpne/cpxne (cbeq/cbeqa/cbeqx) instruction and cleaned up

Now the whole instruction set is available via the assembler.

I also annotated the S08-only instructions (but they are not currently
hidden for 908 targets), and cleaned up some comments.

nickhen/muforth,nickhen/muforth