CALCEPH integration

[attipaci]

Provides optional ephemeris support via the CALCEPH C library in separate solsys-calceph.so[.1] / .a plugin libraries.

To enable, CALCEPH_SUPPORT must be set to 1 prior to the build (in the shell or in config.mk) and you must have access to the CALCEPH development files (C headers and unversioned libaries).

Added functions are:

• int novas_use_calceph(t_calcephbin *eph) -- to specify and use ephemeris data via CALCEPH for minor bodies, and possibly also for major planets too, depending on further configuration.

• int novas_use_calceph_planets(t_calcephbin *eph) -- to specify and use ephemeris data for major planets (and Sun, Moon, SSB), such as say JPL's DE440.

• int novas_calceph_use_ids(enum novas_id_type idtype) -- to specify whether object.number in NOVAS_EPHEM_OBJECT type objects is a NAIF ID (default) or else a CALCEPH ID number of the Solar-system body.

To use the plugin, you must link your application with:

 -lsolsys-calceph

[attipaci]

Needs tests, CI, and coverage data...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.65%. Comparing base (e40fbcc) to head (41b6b51).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #85   +/-   ##
=======================================
  Coverage   99.64%   99.65%           
=======================================
  Files           7        8    +1     
  Lines        2843     2888   +45     
  Branches      551      554    +3     
=======================================
+ Hits         2833     2878   +45     
  Partials       10       10           

Flag	Coverage Δ
unittests	99.65% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/naif.c	100.00% <100.00%> (ø)
src/novas.c	99.54% <100.00%> (+<0.01%)	⬆️
src/super.c	100.00% <ø> (ø)

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4997c38...41b6b51. Read the comment docs.