Geonum

Geonum works both in Python 2 and 3 now (tested for 2.7 and 3.6). This release only includes some new features, for instance, a formula to compute the altitude as a function of pressure (and other relevant atmospheric parameters).

Further changes

- Import or requirements now more flexible
- Removed dependency to LonLat library (still supported though) to LonLat23
- Minor bug fixes

Just some minor I/O improvements and improved flexibility for the computation of elevation profiles.

The major difference between the previous and this release is that the automatic online access to SRTM data in `GeoPoint` objects can be deactivated via the class attribute `auto_topo_access`.

This version includes the module atmosphere.py which can be used for all sorts of atmospheric calculations, for instance temperature, pressure, density retrievals as function of altitude (and geo position) as well as calculations related to Rayleigh scattering (refr. index, depolarisation, Rayleigh extinction). Examples will follow, most of the methods should be self-explanatory, though.