updated for version 7.3.1013
Problem:    New regexp logging is a bit messy.
Solution:   Consistently use #defines, add explanatory comment. (Taro Muraoka)
Added tag v7-3-1013 for changeset 1be43c095aff
updated for version 7.3.1014
Problem:    New regexp state dump is hard to read.
Solution:   Make the state dump more pretty. (Taro Muraoka)
Added tag v7-3-1014 for changeset 6a2005efa02b
updated for version 7.3.1015
Problem:    New regexp engine: Matching composing characters is wrong.
Solution:   Fix matching composing characters.
Added tag v7-3-1015 for changeset 45f97c349537
updated for version 7.3.1016
Problem:    Unused field in nfa_state.
Solution:   Remove lastthread.
Added tag v7-3-1016 for changeset 5cc98a5898cf