Make sure ephemeris files are renamed if more than one has the same name
There's a minor bug in that if more than one ephemeris file has the same base name (i.e., content
, after having been downloaded by astropy), but there's a file that doesn't have that name (i.e., because it comes with the LALSuite release), then the files with the same name won't get renamed. This MR fixes that bug.