Workspace not named/grouped properly after fitting

[Arturs Bekasovs]

To reproduce:

1. In MuonAnalysis, load a workspace, e.g MUSR15189.
2. Plot something.
3. Do any kind of fitting on the new plot.
4. Try to plot something else. The new plots have incorrect names and are not grouped properly.

This happens because when grouping fitted workspaces in MuonAnalysisFitDataTab::groupFittedWorkspaces() we overwrite the workspace group which MuonAnalysis holds a pointer to for grouping and naming.

[Arturs Bekasovs]

Refs #9494. Store the current label instead of a pointer to ws group

The label gets updated when new data is loaded and is used for workspace naming and grouping. This seems to be more robust than storing a shared pointer and fixed the problem.

Changeset: a8b2aea6ac369c224ae17719c89fa1bdf12166c0

[Arturs Bekasovs]

Refs #9494. Make the grouping function add to group if it exists

It makes it potentially faster and we can check for duplicates to avoid endless warnings.

Changeset: f314dbdd4b2436b220307fba28ddd406fc6cb18f

[Arturs Bekasovs]

Refs #9494. Set the correct include path

Forgot to fix that when rebased the ticket onto the master

Changeset: 1d2bd53d51c3e87a1120a97141a2d3a15bf27a6b

[Arturs Bekasovs]

Tester:

Check that the problem was fixed.

And in general - load a few data sets, produce various types of plots, fit them, making sure everything ends up in the correct group and is named properly. Try to brake it!

[Anders Markvardsen]

Merge remote-tracking branch 'origin/bugfix/9494_muon_empty_group_name_after_fitting'

Full changeset: ​6ed110a37eaec94f276c0579d7fecb0e8102627e

[Stuart Campbell]

This ticket has been transferred to github issue ​10337