Added Water Quality Consideration to SWH

Stormwater harvesting functionality now considers water quality
treatment prior to sizing of storages.

Biofilters now do water recycling. At lot scale, they are coupled with
tank system, at neighbourhood/subbasin scale they are coupled with a
pond (open water body). Their design takes this into account.

Added the feature of 'integrated storage' to the technologies. This
distinguishes between different system types  combinations (e.g.
biofilter draining into a storage vs. wetland containing enough storage
space).

Updated GUI, biofilter's recycling checkbox now active.