Seobnrv4 phm review end

Description

Introducing SEOBNRv4P into master, as per the review https://git.ligo.org/waveforms/reviews/seobnrv4p

This merge request supersedes !987 (closed)

API Changes and Justification

Backwards Compatible Changes

• This change introduces no API changes
• This change adds new API calls

Backwards Incompatible Changes

• This change modifies an existing API
• This change removes an existing API

Review Status

Details of the review given at the wiki indicated above.