postbio - postbio: Changes: - Modified function and index names for

Log Message:
-----------
Changes:
 - Modified function and index names for int_interval to avoid conflict with
 other packages;
 - Added receive and send methods for int_interval type;
 - stree type is now a "regular" varlena type;
 - Added receive and send methods for stree type.

Modified Files:
--------------
    postbio:
        Makefile (r1.5 -> r1.6)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/postbio/postbio/Makefile?r1=1.5&r2=1.6)
        postbio.c (r1.2 -> r1.3)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/postbio/postbio/postbio.c?r1=1.2&r2=1.3)
        postbio.sql.in (r1.4 -> r1.5)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/postbio/postbio/postbio.sql.in?r1=1.4&r2=1.5)
        stree.c (r1.3 -> r1.4)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/postbio/postbio/stree.c?r1=1.3&r2=1.4)

Added Files:
-----------
    postbio:
        intinterval.c (r1.1)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/postbio/postbio/intinterval.c?rev=1.1&content-type=text/x-cvsweb-markup)

Removed Files:
-------------
    postbio:
        interval.c
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/postbio/postbio/interval.c)