updated for version 7.3.1110
Problem:    New regexp matching: Using \@= and the like can be slow.
Solution:   Decide whether to first try matching the zero-wdith part or what
	    follows, whatever is more likely to fail.
Added tag v7-3-1110 for changeset 3849c811cc0b
updated for version 7.3.1111
Problem:    nfa_recognize_char_class() implementation is inefficient.
Solution:   Use bits in an int instead of chars in a string. (Dominique Pelle)
Added tag v7-3-1111 for changeset 43de4ebbe7ad
updated for version 7.3.1112
Problem:    New regexp engine: \%V not supported.
Solution:   Implement \%V.  Add tests.
Added tag v7-3-1112 for changeset 749e2b2755d5