Separated navigation for conference vs. acts

In all other respects, the work and filters are exactly the same but I
separated the actions and the navigation on the sidebar.
Turn off precon

Set Thursday to 0.
Created privilege and user setup

For Show Com and Show Chair, also added some constants for the breakout
of the people deserving bios - teachers, performers, special guests,
vendors, but that's not fully complete.

Still need to run through all privilege related settings for someone
who is exclusively a show committee member or chair and need to
separate the pages with specialized filters.
Documentation of how to add a role.

It ain't pretty, but at least it's written down.