Support custom sort order in the report

[damithc]

Current:

The problem: There is no way to display items in a custom order that we want (e.g., order of importance)

Suggestion: Allow a none (or custom) option that will sort items in the order they are specified in config files. That way, we can order the items in config files in any way we want and get the report to follow that same order.

This can apply to sorting of both groups and within groups.