updated for version 7.3.1010
Problem:    New regexp: adding \Z makes every character match.
Solution:   Only apply ireg_icombine for composing characters.
	    Alsl add missing change from patch 1008. (Ken Takata)
Added tag v7-3-1010 for changeset 36ddcf4cecbc
updated for version 7.3.1011
Problem:    New regexp engine is inefficient with multi-byte characters.
Solution:   Handle a character at a time instead of a byte at a time.  Also
	    make \Z partly work.
Added tag v7-3-1011 for changeset 55bcaa1d2749
updated for version 7.3.1012
Problem:    \Z does not work properly with the new regexp engine.
Solution:   Make \Z work.  Add tests.
Added tag v7-3-1012 for changeset 432a6b8c7d93