updated for version 7.4.499
Problem:    substitute() can be slow with long strings.
Solution:   Store a pointer to the end, instead of calling strlen() every
	    time. (Ozaki Kiichi)
Added tag v7-4-499 for changeset 65e72747feca
updated for version 7.4.500
Problem:    Test 72 still fails once in a while.
Solution:   Don't set 'fileformat' to unix, reset it. (Ken Takata)
Added tag v7-4-500 for changeset fd4dc6581b0e