Modify `FileSignature` so that it can be relocated based on content#573

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nedtwigg wants to merge 3 commits intomasterfrom feat/relocatable-filesignature

+220-11

Commits on May 10, 2020

Modify FileSignature so that it can be relocated based on content if desired, or rely on local timestamps if you don't care about relocating.
nedtwigg
committed
Fix missing exceptions.
nedtwigg
committed
Fix spotbugs warning.
nedtwigg
committed