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Optimised io.datafind.find_frametype for multiple channels

Duncan Macleod requested to merge github/fork/duncanmmacleod/datafind-find-optimisation into develop

This PR introduces a rewrite of the gwpy.io.datafind.find_frametype method to support searching for matching types for multiple channels. TimeSeriesBaseDict.find has been patched to use this new functionality, which should greatly speed up multi-channel finds.

The logic in the new find_frametype looks very complicated, but hopefully the inline comments are enough to help readers understand the flow.

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