Add Initial position and orientation

Merged François Trigaux requested to merge InitialPosition into main

This branch adds the ability to specify an initial orientation and position for the root.

It also solves 2 bugs:

  • InputSolve() function must take the index of the input it solves, otherwise the extrapolation is wrong
  • For the Python interface, passing pointer for a fortran array does not work. ND_ARRAY_3x3 must be used instead

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