libpqtypes - libpqtypes: Finalized the PQspecPrepare API and behavior,

Log Message:
-----------
Finalized the PQspecPrepare API and behavior, fixed a few bugs as well.

Modified Files:
--------------
    libpqtypes/docs/man3:
        PQexecf.3 (r1.2 -> r1.3)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/docs/man3/PQexecf.3?r1=1.2&r2=1.3)
        PQspecPrepare.3 (r1.3 -> r1.4)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/docs/man3/PQspecPrepare.3?r1=1.3&r2=1.4)
        pqt-specs.3 (r1.10 -> r1.11)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/docs/man3/pqt-specs.3?r1=1.10&r2=1.11)
    libpqtypes/src:
        exec.c (r1.16 -> r1.17)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/src/exec.c?r1=1.16&r2=1.17)
        libpqtypes.h (r1.21 -> r1.22)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/src/libpqtypes.h?r1=1.21&r2=1.22)
        param.c (r1.19 -> r1.20)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/src/param.c?r1=1.19&r2=1.20)
        regression-test.c (r1.19 -> r1.20)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/src/regression-test.c?r1=1.19&r2=1.20)
        spec.c (r1.3 -> r1.4)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/src/spec.c?r1=1.3&r2=1.4)