Feature authorization

This patch enables primitive authorization by enabling "authorization" in the settings menu.

After authorization is enable access to specific views like objectbrowser and settings is enabled only two users who have the "administrators" role.

Give the administration role to a user by editing adagios.conf and putting:

administrators = "user1,user2,group1,group2,nagiosadmin"

i.e. a comma seperated list of who has access to the role. you can input one of the following:
* A user
* A contactgroup name
* the magic word "user" for all logged in user
* the magic word "contacts" for all valid contacts
* the magic word "everyone" for anonymous and logged in users