v2020.1.0 release
A full release of flipchem that works on Windows, macOS, and Linux!
Some changes include:
- two jupyter notebooks: one explaining the origin of the ion-neutral collision frequency formulas in msis.py and the other showing a small example of how to get altitude profiles of ion densities
- the "success" flag returned by flipchem is now returned as a boolean
- changes to setup.py to facilitate installation on windows machines.