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Added option to cast ligolw types to numpy when reading Tables

Duncan Macleod requested to merge github/fork/duncanmmacleod/ligolw-numpy-dtypes into develop

This PR implements a new keyword argument use_numpy_dtypes when reading LIGO_LW-format XML files into a Table. This casts known custom object types to numpy types to prevent numpy.object_ dtypes in the returned table (since e.g. HDF5 can't write them).

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