Add a note that Scope of mempty isn't the scope of the empty module
Add a test that trivialy eta-reducable hints don't get reduced, or you get duplicate hints
Fix up grep to use a correct module scope
Drop the exact and color flags from grep, were not used
Add handling of parse errors when running grep
If the ideaHint is empty, don't show the severity, makes it a bit more flexible
Change Grep to generating Idea's which it prints out