Assigning MultiTimestampsVector to structure doesn't properly disown memory

@karl-wette @david-keitel

Following our last discussions, it looks like the problem is related to assigning the multiTimestamps member of CWMFDataParams.

This code should not fail and the result of make_array_at_once should be copied (as in "deep copy") into the structure; that's not the case, only the top array is properly copied.

import lal
import lalpulsar

class FaultyClass:

    def __init__(self):

        self.cwmf = lalpulsar.CWMFDataParams()
        self.cwmf.multiTimestamps = make_array_at_once()

class FaultyClass2:

    def __init__(self):
        multi_timestamps = lalpulsar.CreateMultiLIGOTimeGPSVector(1)
        time_gps_vector = lalpulsar.CreateTimestampVector(10)
        for ind in range(time_gps_vector.length):
            time_gps_vector.data[ind] = lal.LIGOTimeGPS(
                    ind, ind
            )
        time_gps_vector.deltaT = 0
        multi_timestamps.data[0] = time_gps_vector

        self.cwmf = lalpulsar.CWMFDataParams()
        self.cwmf.multiTimestamps = multi_timestamps


def make_array_at_once():
    multi_timestamps = lalpulsar.CreateMultiLIGOTimeGPSVector(1)
    time_gps_vector = lalpulsar.CreateTimestampVector(10)
    for ind in range(time_gps_vector.length):
        time_gps_vector.data[ind] = lal.LIGOTimeGPS(
                ind, ind
        )
    time_gps_vector.deltaT = 0
    multi_timestamps.data[0] = time_gps_vector
    return multi_timestamps


# Either of these fails
print(FaultyClass2().cwmf.multiTimestamps.data[0].data[0])
print(FaultyClass().cwmf.multiTimestamps.data[0].data[0])