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)

aaargh, commit flood. I shouldn't leave debugging statements in when committing, I shouldn't leave debugging statements in when commiting, I shouldn't leave ...

from the better-late-than-never department, here's a stupidly overcomplex yet incomplete way of adding new books. Doesn't deal with tagging yet, but better than nothing, don't you think? Maybe someone else should rewrite the whole library component in an afternoon following KISS principles soon ;-)