Audit rules restricting admin actions based on active contests or groups

The contract currently defines some rules restricting actions the admin can take on groups or contests after the contest or group becomes active. For instance, the admin is prevented from adding new voters to a polling group once that group has contests.

Compile a complete list of such restrictions, and determine whether these restrictions should be kept in the contract, or dropped.

The motivation for this is based on the observation that a Pollaris deployment exists by and for the admin, and the admin has power to manipulate the results of the polls if he so desires. Pollaris is intended to give the admin confidence in the integrity of the results. If the admin wishes to erode that integrity, he can do so, but if in his efforts to respond to life's vicissitudes, he needs to make some unusual changes in order to get a result with integrity, the system should not prevent him from doing so simply because it looks strange on paper; it should merely warn him of the potentially unforeseen consequences of his actions (GUI issue).