Added access-controls to admin-option editing; general cleanup of views.py.

Added access-controls to admin-option editing; general cleanup of views.py.

Admin-option editing was public; that's changed, you must now be an
'admin' which for now means you are Django's 'user.is_staff'.

I reorganized views.py into more-logical sections, and think we are
going to split it up into multiple views/* files.

git-svn-id: svn://svn.open-ils.org/ILS-Contrib/servres/trunk@164 6d9bc8c9-1ec2-4278-b937-99fde70a366f