ssapy requires large data files to work

[rusu24edward]

ssapy init imports simple, which defines ssapy orbit. The function signature includes a call to ssapy_prop, meaning that this gets run on import. This function populates all the planets by reading out of the data files. The way this is setup, you have the probably inadvertent result that in order to use any part of ssapy, you have to have downloaded all the lfs files.

[rusu24edward]

Need to be more explicit about accessing the data files, can't just do this implicitly

[rusu24edward]

Talk to Travis Yaegar about how simple.py is used (or Kerrianne Pruett)