don't (re)link fragments in fill, close gap if overlap w linked fragment #508
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Fixes #393, alternative to #505
Having reached the conclusion that we might not be able to determine overlap when storing /context responses in the timeline event store, this PR assumes all fragments are sync fragments and don't need to be linked up when backfilling. Thus the solution to find overlap becomes simpler and we close the gap when at least one event with the expected fragment id is found in the /messages response.