Fix primitive table lexical analysis.

Sequences of digits in the table of a primitive may be matched
as decimal numbers instead of digits, and this breaks some
primitives.
Merge branch 'master' into vec4-stack
vec4 versions of compressed assignment statements.
vec4 handling of DARRAY of vec4 vectors.
More vec4 support for various things.
Fix dangling vec4 stack when force assignment is suppressed.

Also improve the %debug/thr instruction.