Remove useless assert.
vec4 implementations of real ternary and vec4 to real casts.
fix broken call-out of real-valued system functions.
vec4 vvp support for non-blocking assign with delay and part offset.
vec4 non-blocking assign to array swapped delay and part offset!
Fix vec4 abs() generating duplicat labels.
Implement assign/vec4/off/e
various vec4 fixes.