Improve findfeature's overlap pre-processing

[jessemapel]

Right now, findfeatures does very rudimentary checks for overlaps between images. This has been worked around by using isisminer's overlap calculations and filtering. In order to make findfeatures more usable without isiminer, and to help handle errors in isisminer configs more gracefully, we should add the ability to recheck image footprint overlaps in findfeatures.

This is coming largely from comments on #556

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