Create an Instrument Data Service (IDS)

[NickDraper]

Instruments should be ‘Owned’ by a data service (IDS) in a similar way to Workspaces.

The Load Instrument Algorithm should check that a suitable intstrument has not already been loaded with the data service before loading it fresh.

Also we need to add a fuinction to an Intrument (or workspace) to create an unique copy of the instrument for this workspace. This would:
- Copy the existing instrument to a new one (all the way down the tree)
- Register the new instrument into the IDS
- Clear the IDS when the framework manager clear command occurs
- Check that all new workspace creations in all algorithms pass on the reference to the instrument as appropriate.

[NickDraper]

This issue was originally trac ticket 149