first try
intermediate commit
test commit
Implementation of drag seems valid now
First proper working version
First attempt to implement attitude handling
writing some comment
changed default boundaries for integration
fixed buullshit
okay
fixed comments and checkstyle
fixed checkstyle
Work in progress on DSST short periodics.

This work was done by Lucian Barbulescu, Petre Bazavan, Sorin Scortan
and Nicolas Bernard.
Merge branch 'master' into dsst-short-periodics
Announce short periodics terms commputation for DSST.
fixed step size computation
Work In Progress on adding acceleration to PVCoordinates.
Work In progress on acceleration.
Merge branch 'master' into position-velocity-acceleration
Moved PVASampleFilter out of PVCoordinates class.