Add detection of fastest repository
Whitespace
Improve automatic repo detection if first fails

If detection fails the first time, we now try again with
a longer timeout and a smaller file.
Add support for 14.04
Warn if installing on an unsupported Ubuntu ver

Before, an error was given but we did not exit.
Add Evince AppArmor fix

This is needed so that Evince is allowed to access TeX Live fonts.