Add concordances, parallel to reconstructions
Reorganized and expanded test suite
Corrected reconstruction test
Added tests to concordance branch
Begin generalizing reconstructions and concordances as "supplied parts"
Reorganized and expanded test suite
Test emendations
No need to handle emendations here
Revisions to tests to match new format (more explicit typing)
Completed abstraction of reconstructions etc. to "supplied parts"
Improved labelling of sources in popups
Merge branch 'concordance'
Merge branch 'source-names'