WIP: More derivatives

Philipp Frankrequested to merge
more_derivatives_pf into more_derivatives

Start to include DiffTensor and Taylor into nifty. Taylor is now an Operator. Operators can now keep track of higher derivatives via Taylor Objects.

Open Issues and Todos:

  • Write Tests
  • Linearization vs Difftensor I think the latter can replace the former at some point

@parras @mtr I am happy for any input, suggestions!

Edited by Philipp Frank

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