Full Election (Multi-Contest) Tabulation

[artoonie]

Allow election administrators to load in many contest configurations and tabulate them all in a nice GUI.

Open questions:

• Do they get a tabulation verification interface for each GUI?
• Maybe this GUI just launches RCTab with an existing config, plus pops up the tabulation screen?
• Or perhaps it does not pop up the configuration screen at all, and only pops up the tabulation screen? This seems best but the most effort.