First rework of the siteadmin role

- ADMIN org removed.

- Siteadmins are now identified by the perm_site_admin flag

- Siteadmins can now be of any organisation

- editing the regexp / whitelist rules can now be done by a special user with the perm_regexp_access in his/her role

- Executing a mass replace of attribute values based on the regexp rules cannot be initiated by a regexp/whitelist user, only by a site admin

- If the login page is reached without any users / roles defined they are automatically created (perviously it was only the user that was created)

- Org admins are restricted from assigning perm_site_admin, perm_sync and perm_regexp_access roles to users. This can only be done by a site admin.
Merge branch 'feature/roleChanges' into feature/XML_and_UI

Conflicts:
	app/Controller/UsersController.php
	app/View/Regexp/admin_add.ctp
	app/View/Regexp/admin_edit.ctp
	app/View/Regexp/admin_index.ctp
	app/View/Roles/admin_add.ctp
	app/View/Servers/add.ctp
	app/View/Servers/edit.ctp
	app/View/Servers/index.ctp
	app/View/Servers/pull.ctp
	app/View/Servers/push.ctp
files left off added
Small changes after merging the two feature branches

- Update to the representation of the new permission flags

- some small issues with the merge resolved