Switch from SOFA to ERFA

Required updating PAL to v0.5.0 and ERFA is v1.1.0.

One test was modified because palObs now returns additional
telescopes.
Add more of the PAL constants to the API
Alphabetize properly
Add new refraction routines and associated tests

Added: atmdsp, refcoq, refro and refv.
Add planet/element interfaces

Added el2ue, pertel, pertue, planel, planet, plante, plantu,
pv2el, pv2ue, rdplan, ue2el, ue2pv