Added tracking of threads in a forum and replies to a root post to the forums-forums and forums-messages datamodel, and fixed the necessary code. Also cleaned up some stuff and wrote a test case for automated testing. PG only at this point, will add the Oracle stuff shortly.
fixes for the format field: fix dropping html_p in the upgrade script, remove references to html_p and use ad_html_text_convert -from $format for formatting messages, bump version to 1.0.2, bump dependency on notifications to 5.1.1, retag openacs-5-1-compat.