psqlodbc - psqlodbc: Correct the handling of 0-length charcter

Log Message:
-----------
Correct the handling of 0-length charcter parameters of Catalog functions.
Update a documentation.

Modified Files:
--------------
    psqlodbc:
        convert.c (r1.146 -> r1.147)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/psqlodbc/psqlodbc/convert.c.diff?r1=1.146&r2=1.147)
        misc.c (r1.50 -> r1.51)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/psqlodbc/psqlodbc/misc.c.diff?r1=1.50&r2=1.51)
        version.h (r1.78 -> r1.79)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/psqlodbc/psqlodbc/version.h.diff?r1=1.78&r2=1.79)
    psqlodbc/docs:
        config.html (r1.4 -> r1.5)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/psqlodbc/psqlodbc/docs/config.html.diff?r1=1.4&r2=1.5)