Issue with importing modules

[aalonsop]

When running a case.py script (such as barbaggio.py or ballarat.py for example) importing some modules from the preprocessing folder might not work.
Particularly when using the file learnFuelTifPng one has to modify line 27:
old code:
from . import get_WSEN_LBRT_ZS_From_Pgd, arrayToPng, create_kml
working code:
from preprocessing.ffToGeoJson import get_WSEN_LBRT_ZS_From_Pgd, arrayToPng, create_kml

[aalonsop]

Similar for the file extract_from_eu_land_cover.py