Refs #6473. Initial functionality of running/stopping.

Fitting itself is not done yet, is simulated by just loading files for
now.
Refs #6473. FitPropertyBrowser: make method public.

This is quite a useful method for leaving decision on which function
exactly to use for fit to the property browser.
Refs #6473. Function for getting run title from workspace.
Refs #6473. Using better way to get fitting function.
Refs #6473. Setting initial values for inputs.
Refs #6473. Minor refactoring.
Refs #6473. Initial fitting implementation.
Refs #6473. Diagnosis table is being populated now.
Refs #6473. Various minor improvements.
Refs #6473. Minor improvements.
Refs #6473. Logic for init/sequential fitting options.
Refs #6473. Showing errors in the diagnosis table.