Preparing compressed attic relations: shell without diff algorithm.
Compress attic relations: implemented a first simple compression algorithm and a converter.
Cleared a test bug before converting attic relations.
Refactoring.
Relation deltas: preparations.
Relation deltas: preparations.
Compressing attic relations: a version that at least works.
Compress attic relations: implemented and tested.
Merge branch 'global-diff-output' into speedup-relations