Modify the AnalysisDataService to hold more than just Workspaces

[mantid-builder]

This issue was originally TRAC 6797

Original Reporter: Russell Taylor

This ticket is blocked by :

• TRAC6187

We want the ADS to be able to hold objects other than just workspaces. This will be achieved by changing the held type to Kernel::DataItem (which is already a base class of Workspace). People will then be able to store outputs of analyses that are not workspaces (of course their objects will need to inherit from DataItem).

A potential blocker on this is the call to Workspace::setName in AnalysisDataServiceImpl::rename. This will be addressed by http://trac.mantidproject.org/mantid/ticket/6187.

[mantid-builder]

Russell Taylor (2013-05-09T18:31:28):
Still an aspiration, but not as urgent as previously thought.[[BR]](The SelectionNotificationService class introduced in http://trac.mantidproject.org/mantid/ticket/6758 turned out to just want to use the notification part of DataService, not store anything at all!)

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@NickDraper (2014-02-14T11:04:59):
Bulk move to assigned at the introduction of the triage step

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Russell Taylor (2014-06-16T19:08:52):
Orphaning tickets that I won't have time to look at.

[NickDraper]

This is being addressed by the workspaces refactoring item in the 5 year strategy - archiving