Python 3 version ewatercycle/pcrg-grpc4bmi

[sverhoeven]

Trying to build pcrg-grpc4bmi against https://github.com/eWaterCycle/grpc4bmi/tree/newest-bmi-support with

docker build -t ewatercycle/pcrg-grpc4bmi:newest-bmi-support .

Fails with Could not find a version that satisfies the requirement black (from bmipy->grpc4bmi==0.2).

As Pcrglob is Python 3 compatible the Docker image should be rebuild to use Python 3.

[sverhoeven]

The ewatercycle/pcr-globwb_model Docker image needs to be updated to Python 3 first.

[sverhoeven]

Started on ewatercycle/pcr-globwb_model:py3pcr421image in https://github.com/eWaterCycle/PCR-GLOBWB_model/tree/bmi_fixes-docker-py3pcr421 using Python3 and ewatercycle/pcraster-container:421 image.

Run fails with unicode errors and index errors