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Rename unpickling functions to avoid collision with module

Leo P. Singer requested to merge leo-singer/lalsuite:pickle-lal-series-collision into master

The unpickling function for instances of REAL8TimeSeries and similar classes was called lal.series, which collided with a submodule of the same name. In a multiprocessing application, this would confuse Python's pickling machinery and cause this exception:

multiprocessing.pool.MaybeEncodingError: Error sending result:
'...'. Reason: 'PicklingError('first item of the tuple returned
by __reduce__ must be callable')'

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