More generalized cleanup procedure: introduced new method data_collection_cleanup
instead of simply calling close_fast_shutter for cleanup. The data_collection_cleanup
can then be easily customised for each institute.
In order to keep the old ESRF behaviour, overwrite abstract method in ESRFMultiCollect
and call close_fast_shutter from there.
Merge pull request #46 from hellmig/bessy_dc_cleanup

More generalized cleanup procedure: introduced new method data_collectio...