libpqtypes - libpqtypes: Added PGregisterType structure to be used with

Log Message:
-----------
Added PGregisterType structure to be used with all new PQregisterXXX functions.  Updated all man pages.  Ensured
PQresetis properly re-registering type handlers by calling appropriate register function.  Added 'regtype' member to
PGtypeHandlerto indicate which registration function should be called during a PQreset (PQT_REG_TYPE_XXX enum) 

Modified Files:
--------------
    libpqtypes/docs/man3:
        PQparamCreate.3 (r1.6 -> r1.7)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/docs/man3/PQparamCreate.3?r1=1.6&r2=1.7)
        PQregisterComposites.3 (r1.1 -> r1.2)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/docs/man3/PQregisterComposites.3?r1=1.1&r2=1.2)
        PQregisterSubClass.3 (r1.1 -> r1.2)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/docs/man3/PQregisterSubClass.3?r1=1.1&r2=1.2)
        PQregisterUserDefinedTypes.3 (r1.1 -> r1.2)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/docs/man3/PQregisterUserDefinedTypes.3?r1=1.1&r2=1.2)
        PQspecPrepare.3 (r1.10 -> r1.11)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/docs/man3/PQspecPrepare.3?r1=1.10&r2=1.11)
        pqt-composites.3 (r1.5 -> r1.6)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/docs/man3/pqt-composites.3?r1=1.5&r2=1.6)
        pqt-handlers.3 (r1.8 -> r1.9)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/docs/man3/pqt-handlers.3?r1=1.8&r2=1.9)
    libpqtypes/src:
        events.c (r1.10 -> r1.11)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/src/events.c?r1=1.10&r2=1.11)
        handler.c (r1.17 -> r1.18)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/src/handler.c?r1=1.17&r2=1.18)
        libpqtypes.h (r1.27 -> r1.28)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/src/libpqtypes.h?r1=1.27&r2=1.28)
        regression-test.c (r1.23 -> r1.24)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/src/regression-test.c?r1=1.23&r2=1.24)