Tests "testEphemeris" in DSST propagation are very long
Tests:
- FieldDSSTPropagatorTest.testEphemerisGeneration
- DSSTPropagatorTest.testEphemerisGeneration
Are too long (respectively about 10s and 40s) for what they intend to do (comparing classical propagation to ephemeris propagation).
Propagation is performed on 30 days while it could be much smaller to test the validity.
Also, the threshold of the test on the maximum error could be tightened a lot (it's a pure 0 while the threshold is 1e-10).