Added search module

Put a placeholder into that user link part so I don't forget to fix it ;-)

First commit! Woohoo! Basic status of things is in extended description. * You can write blog posts and view them in a standard blog-like index page * All blogs are per-user and blogs can be made public or private * Setting permissions on a per-blog/per-post basis should work except for some inheritance issues * Planets are not in any way implemented * Tagging posts does not work * Basically the only thing you can do is write and display posts and make comments. It's basic, but it works. More to come very soon!