Refs #8700. Namespace clean-up.
Refs #8700. Adding logs to *_Workspace when doing a single fit.
Refs #8700. Adding a logs to *_Workspace in seq. fit.
Refs #8700. Change the way list of fitted workspaces is retrieved.

Now we just take a list of all *_Workpace workspaces and work with
them. Original data is not required anymore.
Refs #8700. No need to store loaded seq. fitting workspaces.
Refs #8700. Minor code clean-up.
Refs #8700. Merge remote-tracking branch 'origin/master' into 8700

Conflicts:
	Code/Mantid/MantidQt/MantidWidgets/src/MuonFitPropertyBrowser.cpp
Merge remote-tracking branch 'origin/feature/8700_muon_seq_fit_loaded_ws'