[task #14691] cosmiccal: handle stdin and act as a filter to stdout

[Boud Roukema]

Follow-up Comment #2, task#14691 (group gnuastro):

Ignore my comment "For a further speedup, see
https://savannah.gnu.org/bugs/index.php?65195 for the flat case." The
analytical speedup for the flat FLRW cases with non-zero Lambda (such as LCDM)
is for a(t) or t(a) (Eq (12), [3]; free-software version in [4][5]), *not* for
the radial comoving distance.

Second correction: "- at 1 microsecond/redshift. With ..." should have read ".
At 1 microsecond/redshift, with..." 

(LSST/Rubin will give us billions of galaxies with multi-band photometry fast,
but I'm not going to try now to convert that to time per photo-redshift. :))

[3]  Sahni, Varun ; Starobinsky, Alexei, 2000, IJMPD, 9, 373
https://ui.adsabs.harvard.edu/abs/2000IJMPD...9..373S
https://arxiv.org/abs/astro-ph/9904398

[4] https://codeberg.org/boud/inhomog/src/branch/master/lib/FLRW_background.c


[5]
https://codeberg.org/boud/inhomog/src/branch/master/lib/test_scale_factor.c


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