gperl: Improve handling of .Perl lines.  Version 1.2.4
gpinyin: new preprocessor for adding pinyin parts, the European-style Chinese writing
Makefile.in, ChangeLog: forgotten to git add for gpinyin
groffer: version 2.2.3
groffer: add utf8 and make it the default for --tty
groff.1: enhance documentation for device utf8.
groff.7: add documentation for the Unicode escapes \[u....] and \[u.....].
groff.7: replace \[rs] by \e as much as is useful
groff.7: add combination of Unicode characters like \[u0041_0301]
groff_char.man: add description for displaying Unicode uxxxx with \[uxxxx]