Re #8675. Changing alg name to follow workflow conventions.
Re #8675. Finished the rename of PDLoadCharacterizations.
Re #8675. First working version without the inner classes.
Re #8675. Listening to the characterization parameters in the gui.
Re #8675. Fixed bug found by system tests.
Merge remote branch 'origin/feature/8675_refactor_snspowderredux'