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Use brute force frdata structure access with frameCPP

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

This PR fixes #1004 (closed) by patching gwpy.timeseries.io.gwf.framecpp to remove calls to FrTOC.GetADC and friends. Simple testing suggests ~30% speed up in reading one channel from one L1_R file, which is nice.

In practice, it should mean that using the type keyword argument, which used to be a necessary extra to minimise memory overhead, should be unnecessary.

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