[Bug] - MetaSWAP area computed differently from iMOD5

[JoerivanEngelen]

Bug description

@Ydrolog just discovered the following differences between iMOD5 and iMOD Python.

1. A second SVAT is placed whenever urban area > 0, but iMOD5 additionally filters cells with a wetter_area snmaller than ~20%
2. iMOD5 is subtracting the wetter area from the area from the cell. iMOD Python attempts to do this as well, but doesn't seem to do this correctly. In his case it resulted in com[uted areas ranging from 625 to ~621.2 instead of 625 to 0 (for 25m cells).
3. iMOD5 excludes cell with 100% wetter area, whereas iMOD Python includes it

[JoerivanEngelen]

Regarding point 1: I just talked to Peter Vermeulen and verified with @Ydrolog:

iMOD5 does an additional filtering of urban cells if the (urban area + wetted area) > cell area, this explains the differences for the Brabant model observed by @Ydrolog.