Querying abstractions that 'need review' or are
'reviewed' should not consider 'blanked' 
abstractions 'reviewed'

Closes #24
Listing abstractions for an abstractable entity
that 'need review' or are 'reviewed' should be
based on abstractions that have been answered.

Closes #23
Clean up the changelog a little bit.
If a user manually adds a row of grouped
abstractions, indirect sources don't work.
Closes #25