Set point Tagging in order to set/identify a particular CU state through this Tag
Description
The problem is to quickly set/recognise the position of a given motor through a meaningful label. Of course this requirement could be generalized to all CUs.
Proposal
Combine the snapshot logic that saves the state of a device, with an API that asks about the state of a given CU, if the current state of a device falls into one of the previously saved snapshots it returns the snapname. Another possible implementation (maybe better) is that every CU fetches from MDS its setpoints and periodically (if enabled) checks against its current state and if something matches it updates a new key into "system channel" that tells the name of the snapshot. This key could be introduced from now, and could be set when a successful restore is performed.