<admin stats> refactor and mods for admin console

Results subclasses were all moved out to a lib file.
Admin::Stats became Admin::Stats::Maker in order to have clean
separation of namespaces and make Rails autoloading happy.
Miscellaneous bits added and adjusted.
<admin suggestions> library to suggest admin changes

Generates config-driven suggestions for:
* Adding capacity
* Removing capacity
* Taking note of unresponsive nodes
* Fixing suggestion config values
Extensible with subclasses.
<admin console> capacity planning

https://trello.com/c/nqlnXBRQ/58-5-allow-admins-to-do-simple-capacity-planning-from-the-admin-console-admin

The admin console displays important systems statistics for capacity
monitoring and planning in a nice visual format. Suggestions can be
configured to display for common needs such as adding capacity.
Various other tweaks and improvements have been made.