V: fork from Pristine/V.

Ignore sub-directories: CAT, PULLCOMS, QUICKFLI, UTILS.
Delete foo, TAGS, *.BAK, *.BAT, *.COM, *.ERR, *.EXE, *.MAP, *.OBJ, *.XXX.
V: switch to tasm.
V: decap source files.
V: add include guard for jimk.h.
V: remove clipline.
V: remove fcontrast.
V: remove pollvstatus.
V: remove shrink4.
V: switch previously converted asm to C.

a1blit
a2blit
bcompare
bcontrast
blit8
bsame
cblock
cdot
chli
clipit
closestc
copy_bytes
copy_structure
copy_words
cvli
exchange_words
fcompare
fcuncomp
fsame
stuff_words
tnsame
tnskip
unbrun
unlccomp
unrun
unsbsrsccomp
xorblock
V: cblock clips to the screen.
V: convert getd.
V: convert stuff_bytes.
V: convert xor_words.
V: convert xor_group.
V: convert xlat.
V: convert back_scan, fixing a possible bug.

Fix possible bug when all 'n' elements in the array are equal to the
reference value.
Merge a1blit and a2blit into blit8.
V: convert tblit8.
V: convert tmove8.
V: convert ublit8.