Update favicons for new themes

add favicon-chillax.png, rename favicon.png to favicon-soylentnews.png,
remove favicon.ico and set favicon-default.png to be the same as
chillax.
Add new favicons to the THEME file
add favicon link tag to header.

based on template name.
Remove images use css for effects

Change more rounded corners to css instead of images.
Remove background image.
Mirror chillax theme in SN red

Used chillax css as starting point and used #933 and #600 for colors.
bugs in syntax and missing schema change.
typo and merge from master
fix issue due to adding a tag styles in theme.css
Properly fix the disable portscan code; previous code seems to evaluate to true

Signed-off-by: Michael Casadevall <mcasadevall@ubuntu.com>