Merge pull request #5 from plaidfluff/master

Fix some whitespace, fix missing stuff in install.php
Favicon service fix
new menu entry: untag all currently visible items
Merge branch 'master' of https://github.com/RomanSixty/Feed-on-Feeds

Conflicts:
	fof-main.php
Made similarity purging optional.

In my installation, the similarity purging step was taking longer than 30 seconds and never actually removing anything, causing things to time out badly.

While I was at it I fixed some formatting and cleaned up some other code.