Limit scope

[j08lue]

This algorithm provider contains scripts for all kinds of things beyond hydrological modelling with MWSWAT, in particular various download and preprocessing scripts.

We would like to deprecate MWSWAT in favor of simpler models but need to keep some of the preprocessing tools.

It would be great if the preprocessing tools were separate from the MWSWAT algorithm providers, so we can include the former in the toolbox but exclude the latter.