Updated the GUI.

Added checkboxes and changed the layout a bit so they fit better.

Removed unused method.

Refs #6693
Added logic for the new check-boxes.

Refs #6693
Refactored the thing a bit.

In order to set values in boxes in a single place.

Refs #6693
Auto-save values for new widgets.

This is done in a bit more clever way, which will potentially
help us in the future if we will need to save other values.

Refs #6693
Removed unused class.

Refs #6693
Change default value to avoid confusion.

Refs #6693
Merge remote-tracking branch 'origin/master' into feature/6693_muon_auto_checkboxes

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

Refs #6693
Merge branch 'feature/6693_muon_auto_checkboxes' into develop