Refs #9566 Option to switch between c++ alg and quick.py added

An option has been added to the options dialog to switch between quick.py (false/unchecked) and ReflectometryReductionOneAuto (true/checked). Defaults to false.

The options dialog has had a bug fixed where the doublespinbox wasn't returning a value and an exception was raised.

ConvertToWavelength has been given another use: creating a list of workspaces from a supplied string. It already did this, but the access functions have now been added.
Refs #9566 Remove debug statement

I'd forgotten to remove a print type() line. It has now gone.
Merge remote-tracking branch 'origin/feature/9566_ReflReductionAuto_replaces_Quick_in_gui'