switched from python2 to python3

source/python/__init__.py

source/python/_config.py

source/python/classes/ControlFile.py

source/python/classes/EcFlexpart.py

source/python/classes/GribUtil.py

source/python/classes/MarsRetrieval.py

source/python/classes/UioFiles.py

source/python/classes/__init__.py

source/python/install.py

source/python/mods/__init__.py

source/python/mods/checks.py

source/python/mods/disaggregation.py

source/python/mods/get_mars_data.py

source/python/mods/prepare_flexpart.py

source/python/mods/profiling.py

source/python/mods/tools.py

source/python/submit.py

templates/compilejob.template

templates/job.temp

templates/job.template