css fix for wide screens.

First time working with git / pull requests, please point out any mistakes :).

The base idea is removing the set width & float from "section#content", making it overlap the sidebar, then assigning a margin-left which makes the sidebar visible again.
Same for wiki pages & forum posts.

All pages with both a sidebar & "#content" need to have a margin added (cannot be added to "#content" itself, otherwise it appears on pool pages & such as well). Tested all that i could think of, but may have missed one.

Tested in opera / firefox / chrome.