Missing double words noted in tests

[patricksurry]

Pulled from the tests:

D0< not implemented yet
D0= not implemented yet
D2* not implemented yet
D2/ not implemented yet
D< not implemented yet
D= not implemented yet
DMAX not implemented yet
DMIN not implemented yet
M+ not implemented yet
2ROT not implemented yet
2VALUE not implemented yet
DU< not implemented yet

[SamCoVT]

I have all of those but DMIN, DMAX, D0< and 2ROT implemented in Forth here:
https://github.com/SamCoVT/ForthSoftware/blob/master/double_words.fs

Does it make sense to bring these into Tali in assembly? Half are already in Tali's assembler and many are quite short (eg. 4 assembly instructions).

I implemented the ones I needed to work on FAT32 and a user asked for one of them (M*/ I think). The missing ones look simple/easy.

EDIT: It looks like M*/ has already been implemented in Tali.

[patricksurry]

yes, these ones actually seem useful/easy/small to add as assembly to the double wordset. it's already optional so making it more complete seems good.

[SamCoVT]

I currently have all of these but M+, 2ROT, and 2VALUE done in a branch (double_words). I'll finish them up when I have time.