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Resolve "[icat] atomic datasets"

Wout De Nolf requested to merge 1898-icat-atomic-datasets into master

Closes #1898 (closed)

The new behavior: the ICAT dataset is created pseudo-atomically when SCAN_SAVING.dataset is set (creates the previous dataset in ICAT). As a result the MetadataManager is most of the time in "STANDBY".

The previous behavior: the ICAT dataset was started when a scan was instantiated (if not already started) and the previous ICAT dataset was closed (when different from the running dataset). As a result the MetadataManager was most of the time in "RUNNING".

Edited by Wout De Nolf

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