Re #9357. Remove Managed Workspaces

along with associated classes and references thereto.

Now that we only support 64 bit we can just fall back on swap when
memory runs out.
Merge branch 'feature/9357_eliminate_managedworkspaces' into develop

Conflicts:
	Code/Mantid/Framework/DataObjects/test/ManagedHistogram1DTest.h
Re #9357.