Conflicts:
	core/templates/layout.guest.php

Step one, open guest layout for different styles.

Conflicts:
	lib/private/vcategories.php

And other small improvements

 - Use camelCase

 - Add some phpdoc

 - Fix some indents

 - Use some more spacing

revert changes to fbbc76f2 because master is very unstable right now

Without an additional name it's nearly impossible to write positive security model based rules since the parameter name isn't defined.

Also check for installed flag because this isn't available before setup