Separates election config into settings.php

Makes password check function in session class public

more helpful error messages are always nice. Tell the user why their hackergotchi image was rejected

Allow members to specify a blog feed in the options component, and generate planet configuration files dynamically. Fixes #64

attempt to strip out hyperlinks and add to post footer. Also change motd file location back to a safe default ;-)

However, bodged it into the pagemap as an emergency fix and opened ticket #61

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