Apparently JPL report URLs sometimes change. I will not be uploading
new versions of these ephemerides, and maybe should remove them someday
from PyPI, but will run "setup.py register" to update the links for now.
Because bare directories with *.py files inside are now considered
packages to Python 3, these directories were being grabbed by the
"import" statement during certain tests, instead of letting Python find
the actual installed ephemerides packages. Bumping them down a level
solves the problem, and also unclutters the top level.