updated for version 7.3.1116
Problem:    Can't build without Visual mode.
Solution:   Add #ifdefs.
Added tag v7-3-1116 for changeset 66a9e8fa6f45
updated for version 7.3.1117
Problem:    New regexp engine: \%[abc] not supported.
Solution:   Implement \%[abc].  Add tests.
Added tag v7-3-1117 for changeset 97560c16ca99
updated for version 7.3.1118
Problem:    Match failure rate is not very specific.
Solution:   Tune the failure rate for match items.
Added tag v7-3-1118 for changeset 6a706ca7a889
updated for version 7.3.1119
Problem:    Flags in 'cpo' are search for several times.
Solution:   Store the result and re-use the flags.
Added tag v7-3-1119 for changeset a62695305e03