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Improved error handling in datafind.find_frametype

Duncan Macleod requested to merge github/fork/duncanmmacleod/296-frametype-on-tape into master

This PR improves the error handling in the gwpy.io.datafind.find_frametype method -- fixes #296 (closed) with a better error message. The main user-level change is that the exclude_tape keyword argument was renamed allow_tape to bring it inline with the TimeSeries.find arguments.

The new error for a channel not found is:

ValueError: Cannot locate 'L1:Test' in any known frametype at GPS=1158710417 [those files on tape have not been checked, use allow_tape=True to perform a complete search]

EDIT: fixes #288 (closed) by improving documentation of the allow_tape kwarg in the TimeSeries object.

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