updated for version 7.3.1217
Problem:    New regexp engine: Can't handle \%[[ao]]. (Yukihiro Nakadaira)
Solution:   Support nested atoms inside \%[].
Added tag v7-3-1217 for changeset 613651492c19
updated for version 7.3.1218
Problem:    "make test" on MS-Windows does not clean all temporary files and
	    gives some unneccessary message.
Solution:   Clean the right files.  Create .failed files. (Ken Takata)
Added tag v7-3-1218 for changeset d10ede931224