- Modify calls to XLALInitBarycenter() due to modified interface from LALInitBarycenter()
- LALBarycenter.h: in EphemerisData struct, store ephemeris filenames in fields 'filenameE'
  and 'filenameS' instead of in distinct struct EphemerisFilenames, which is now removed
- LALBarycenter.h: move prototypes for internal functions to LALBarycenter.c
- LALBarycenterTest.c: remove redundant tests of LALBarycenter() against XLALBarycenter(),
  since the former no longer exists (as has been a wrapper of XLALBarycenter() for some time)
Original: 029fb019e63fa5c47510817e7dfdc1463e7858bd