table: Rename TAB_* to TABLE_CELL_* and reduce from 16 to 8 bits each.
[pspp] / src /
drwxr-xr-x   ..
-rw-r--r-- 1675 automake.mk
drwxr-xr-x - data
drwxr-xr-x - language
drwxr-xr-x - libpspp
drwxr-xr-x - math
drwxr-xr-x - output
drwxr-xr-x - ui