Fixed several issues with removing elements with constraints

- Removing a resource that is part of a resource set is now allowed
- When you try to remove a group from a master that has more than one
  resource you now recieve a helpful error
- Unclone works on clones where constraints have been added
- Removing a group with constraints now works properly
- Master/Slave groups now have constraints properly removed before being
  deleted
Change pcsd start/stop to enable/disable