WIP: Fix spin precessing equations
Description
This merge request supersedes !958 (closed) and correcting implements the S-depedent orbital angular momentum part of the precessing equation, see dcc doc and spin^2 terms at NL order in the phasing.
API Changes and Justification
Backwards Compatible Changes
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This change introduces no API changes -
This change adds new API calls
Backwards Incompatible Changes
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This change modifies an existing API -
This change removes an existing API
Review Status
Review is ongoing, see wiki
Edited by Riccardo Sturani