libpqtypes - libpqtypes: Update ChangeLog and added -fsigned-char to

Log Message:
-----------
Update ChangeLog and added -fsigned-char to configure.ac

Modified Files:
--------------
libpqtypes:
ChangeLog (r1.16 -> r1.17)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/ChangeLog.diff?r1=1.16&r2=1.17)
configure.ac (r1.14 -> r1.15)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/configure.ac.diff?r1=1.14&r2=1.15)