Solved the problem with plotting multiple times when going to DA tab.

Solution - only enable auto-update when ws list was refreshed, as the
plotShow was called multiple times while list is filled.

Refs #5116
Revert some potentially dangerous changes which are not needed anymore.

Refs #5116
No need to remove PP tool on interface start. Plus documentation clean-up.

Refs #5116
Make N/A text to be consistent.

Refs #5116
Single function to set connected data name.

Refs #5116
Deal with situations when there are not workspaces available.

Refs #5116
Merge branch 'feature/5116_fit_with_graph_toolbar' into develop

Conflicts:
	Code/Mantid/MantidQt/CustomInterfaces/src/MuonAnalysis.cpp