ESRF data policy - metadata upload

First step to implement what Antonia suggested: a new HO for the ESRFMetadataManager:

I have moved the buld of the metadata code from ESRFMultiCollect to ESRFMetadataManager
The ESRFMetadataManager is, however, not yet a HO
Call of ESRFMultiCollect.data_collection_hook from ID30BMultiCollect This code has been in production on MASSIF 1 for a couple of weeks.

mxcube / HardwareObjects