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Decorate identifiers to handle cache/list of files

Duncan Macleod requested to merge github/fork/duncanmmacleod/identify_cache_list into master

This PR introduces a new decorator for astropy.io.registry.register_identifier to unwrap a list or glue.lal.Cache of files (normally handed to a Class.read() method) to pull out a filepath for one of the contained files.

This should make writing readers and identifiers a little cleaner.

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