lloda/prop-618: Propagation models for Earth-space communications from ITU-R P.618

lloda d698d6ae47 Relax p.676 Earth-space path condition		il y a 1 an
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test-0.f90	460ddcbfeb Try github workflow	il y a 1 an
test-1.c	26db7ce4de Generated Guile bindings & test	il y a 5 ans
test-2.py	d698d6ae47 Relax p.676 Earth-space path condition	il y a 1 an
test-3.scm	38c7d82496 Fix test re: srfi-64 change in Guile	il y a 3 ans