oneLoopVecOps

Expand ops of vectors via one loop over multiply.

For example,

c = collectVecAsSeq a+b*c

will be expanded as sth roughly like:

for i in 0||(a.len-1):  # `||` will use openMP if available
  c[i] = a[i] + b[i] + c[i]

which would be about (n-1) faster than using n loops.