Added revoking of buffers without releasing datastream and functionality to reuse previously announced bufferes #426
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Found an issue where repeated ia.start() and ia.stop() calls would allocate imcreasing amounts of memory. Appears to be from a combination of ia._create_ds_on_connection = True and no call to data_stream.revoke_buffer() being made at acquisition stop.
Have added _reuse_buffers flag and check to announce or revoke buffers if required number of buffers changed.
No tracking of which datastreams own which so will only work with single datastream cameras