Summary: Fixes T10449. Almanac doesn't do a whole lot for the average user, but is in good shape technically and works well, and exposing it in the cluster won't let installs destroy themselves now.
Test Plan: Re-read documentation; grepped for TODO (there are a couple, but reasonable to push off); browsed around all the UI things (new two-column looks great), called API methods.
Reviewed By: chad
Maniphest Tasks: T10449
Differential Revision: https://secure.phabricator.com/D15400