updated for version 7.3.1017
Problem:    Zero width match changes length of match.
Solution:   For a zero width match put new states in the current position in
	    the state list.
Added tag v7-3-1017 for changeset 532c2e850256
updated for version 7.3.1018
Problem:    New regexp engine wastes memory.
Solution:   Allocate prog with actual number of states, not estimated maximum
	    number of sates.
Added tag v7-3-1018 for changeset 80170d61a85c