libpqtypes - libpqtypes: made PQputf auto-fill unset composite fields

Log Message:
-----------
made PQputf auto-fill unset composite fields with SQL NULLs (it used to error).  The error still occurs but only if the
numberof params exceeds the number of composite fields.  Auto-filling occurs when the number of params falls short.
UpdatedChangeLog. 

Modified Files:
--------------
    libpqtypes:
        ChangeLog (r1.24 -> r1.25)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/ChangeLog.diff?r1=1.24&r2=1.25)
    libpqtypes/src:
        libpqtypes-int.h (r1.12 -> r1.13)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/src/libpqtypes-int.h.diff?r1=1.12&r2=1.13)
        param.c (r1.15 -> r1.16)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/src/param.c.diff?r1=1.15&r2=1.16)
        record.c (r1.6 -> r1.7)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/src/record.c.diff?r1=1.6&r2=1.7)