SMRF package

[scotthavens]

SMRF is now no longer dependent on IPW, enabling SMRF to be compiled and uploaded to pypi.

• Use setuptools_scm to manage the version
• New Docker image that is 1/3 the size of the old and not dependent on IPW image
• moved the tests into the smrf-dev package so it is distributed during the pip install
• Yeah, it's pip installable
• The cloud factor csv in the test data had 1984-2008 which was not needed
• Netcdf output testing to ensure that the version is being properly added
• Test the backup config is adding the version
• Expanded the tox testing for python 3.6, 3.7 and 3.8 on Linux and MacOS
• Automated deployment to pypi
• Most of the changes are from isort and flake8
• Removed older Python 2.7 imports
• Improved the logger handling

[scotthavens]

Other issues that this PR will address:

• fix IPW base docker image is on latest #110
• Address Threading with gridded input data #114 as one theory was that the IPW subprocess calls were not being handled properly with the gridded data
• fix Importing current git tag with python version 3 #53 with setuptools_scm