Fix some comment related bugs.

* Snuownd failed to corrrectly render some novel variations of nested
emphasis.
* Table of contents links are now correctly stripped of formatting tags.
Expanded the sanitizer whitelist

Seriously? Who still uses <font>?
Fixed user highlighter not working properly in the dashboard
moving .beta-notice down for navTop users
bugfix to nextprev that seems to be caused by new multireddit code
simple fix for css hackery changing .text -- just use .textContent
The previous commit was incomplete
updated static resource URLs per reddit changes
adding res-navTop to body tag to make styling it easier when users have this setting on (which most RES users do)
Fix for broken navigation in the autocomplete popup

jQuery's .index() method may have been used incorrectly. It now uses a
more reliable technique.
Merge pull request #418 from gamefreak/fixes

Various fixes
fixed a bug with certain flickr images having the wrong url added to history (so links stayed purple)