[Orekit Developers] Taylor differential algebra available in a branch of the git repository

[MAISONOBE Luc <luc.maisonobe@c-s.fr>]

Hi all,

I have committed Andrea's work from last few months in a new  
taylor-algebra branch
in the main git repository.

As we both the master branch and Andrea's private branch evolved a lot  
and we did
not use git properly for some intermediate merges, we have decided to  
squash everything
in a single commit using the current master branch as the parent. It  
will indeed be much
easier to read this way.

Beware, this code is still Work In Progress! There are for example 9  
tests that fail,
Andrea will have a look at it to complete thi work. There are also  
some parts in the
force models that have not been completed, for example related to  
density in atmosphere
models. So there are TODO comments in a few parts and the  
corresponding code throws
UnsupportedOperationException. Of course, this should also be completed.

I would be happy if anyone in the community could have a look at it  
and help us
complete this work. We intend to merge thi branch back to master as  
soon as possible,
and probably release Orekit 9.0 afterwards.

best regards,
Luc