libpqtypes - libpqtypes: Added PQgetvf and made PQgetf a light-weight

Log Message:
-----------
Added PQgetvf and made PQgetf a light-weight wrapper.

Modified Files:
--------------
    libpqtypes:
        ChangeLog (r1.37 -> r1.38)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/ChangeLog?r1=1.37&r2=1.38)
        Makefile.am (r1.15 -> r1.16)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/Makefile.am?r1=1.15&r2=1.16)
        configure.ac (r1.21 -> r1.22)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/configure.ac?r1=1.21&r2=1.22)
    libpqtypes/docs/man3:
        PQgetf.3 (r1.6 -> r1.7)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/docs/man3/PQgetf.3?r1=1.6&r2=1.7)
    libpqtypes/src:
        exec.c (r1.22 -> r1.23)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/src/exec.c?r1=1.22&r2=1.23)
        libpqtypes.h (r1.23 -> r1.24)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/src/libpqtypes.h?r1=1.23&r2=1.24)