libpqtypes - libpqtypes: added a warning about getf failing after it has

Log Message:
-----------
added a warning about getf failing after it has retrieved an array/composite.  memory leaks can occur is the programmer
isnot aware that the PGresult must still be cleared.  the docs now make it very loud and clear that this must occur. 

Modified Files:
--------------
    libpqtypes:
        ChangeLog (r1.26 -> r1.27)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/ChangeLog.diff?r1=1.26&r2=1.27)
    libpqtypes/docs/man3:
        PQgetf.3 (r1.4 -> r1.5)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/docs/man3/PQgetf.3.diff?r1=1.4&r2=1.5)