Replace all the addslashes with parameterised queries, and attempt to spot anywhere else that failed to escape queries properly

Removing the SUCS Blogs system and Planet. Security flaws, not used, old code. http://lists.sucs.org/pipermail/devel/2015-January/000103.html

stop things breaking horribly if no planet atom.xml is present (e.g. with clean checkouts of the site)