Update Swiss Ephemeris to 2.0
Add seasnam.txt and seorbel.txt datafiles
Add asteroid Circe as GSWE_PLANET_CIRCE
Add alias to GSWE_PLANET_MOON_APOGEE as GSWE_PLANET_LILITH
Reordered planets in GswePlanet

This is to bring some consistency in the API
Add asteroids Orcus and Asbolus
Add GswePlanet planet offsets for later use
Remove two unreliable lines from the test code

A fix must be introduced later, though!