Added for i from ... ['by' step] syntax.

Added for i from ... ['by' step] syntax.

E.g.

for i from 0 <= i < 10 by 2:
    print i

0
2
4
6
8

Old for-from loops remain exactly the same (using the ++ or --). If step is specified, the increment operator will be += step or -= step, depending on the orientation of the inequalities (as before).

NOTE: 'by' is now a keyword