Single-column "diff" view for new code files

Review Request #311 — Created March 27, 2008 and submitted — Latest diff uploaded

Review Board SVN (deprecated)
We've just started using reviewboard and I decided I'd much rather see code from new files in a single, full-page column vs. in a half-page column next to an empty column.  Also, I wanted the background to be white instead of green.  Dunno what you guys think about that but I figured I'd submit the hacks I made to do this.
Verified it works in my install.