Use brute force frdata structure access with frameCPP
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.