- upgrade python3 from 3.5.6 to 3.7.3, python2 from 2.7.15 to 2.7.16 and all python requirements
- upgrade eccodes and use python3 binding from pypi
- add MetPy
- update Fiona and cf-units
- upgrade Magics to 4.0 and build python2/3 api with pypi
- remove scikit-learn from python2_scientific (complicated issue with numpy and atlas on centos7)
- fix building issues with proxy