autodoc - autodoc: Add in very simple inheritance documentation.

Log Message:
-----------
Add in very simple inheritance documentation. Templates other than HTML need to be updated.

Remove support for PostgreSQL 7.1 and 7.2. Continues to support 7.3 and later.

Modified Files:
--------------
autodoc:
html.tmpl (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/autodoc/autodoc/html.tmpl.diff?r1=1.2&r2=1.3)
postgresql_autodoc.pl (r1.11 -> r1.12)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/autodoc/autodoc/postgresql_autodoc.pl.diff?r1=1.11&r2=1.12)
regressdatabase.sql (r1.1.1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/autodoc/autodoc/regressdatabase.sql.diff?r1=1.1.1.1&r2=1.2)