Print end-of-configure notice using AC_MSG_NOTICE

- which also prints to config.log
- useful for debugging how library was configured
  by looking at config.log
Remove -uninstalled suffix from top-level build pkg-config checks

- pkg-config already prefers -uninstalled packages, and top-level configure.ac
  sets PKG_CONFIG_PATH to ensure build tree is searched first for libraries,
  so explicitly specifying -uninstalled should not be necessary
- also remove version requirements from -uninstalled pkg-config files, since
  library configure.ac will perform the same version checks
mfd_v4 and mfdv5: convert to --ephemEarth and --ephemSun command-line arguments

   - and adapted all affected test-scripts
   - refs #989
PrintDetectorState: convert to --ephemEarth and --ephemSun command-line arguments

   -refs #989
FstatMetric_v2: convert to --ephemEarth and --ephemSun cmdline-args

  - refs #989
getMesh: convert to --ephemEarth and --ephemSun cmdline-args

  - refs #989
getMetric: convert to --ephemEarth and --ephemSun cmdline-args

   - refs #989
adjusted cfs_example.cfg: removed ephemDir and ephemYear args

  - refs #989
sw_inj_frames: convert to --ephemEarth and --ephemSun cmdline-args

       - refs #989
pulsar_crosscorr: convert to --ephemEarth and --ephemSun cmdline-args

   - refs #989
pulsar_crosscorr_v2: convert to --ephemEarth and --ephemSun cmdline-args

    - refs #989
HierarchSearchGCT: renamed {--ephemE,--ephemS} to {--ephemEarth,--ephemSun}

   - plus minor modernization of ephemeris-reading
   - refs #989
HierarchicalSearch: renamed {--ephemE,--ephemS} to {--ephemEarth,--ephemSun}

   - plus minor modernization of ephemeris-reading
   - refs #989
RecalcHSCandidates: renamed {--ephemE,--ephemS} to {--ephemEarth,--ephemSun}

   - plus minor modernization of ephemeris-reading
   - refs #989
ComputeAntennaPattern: removed unused function InitEphemeris()

   - refs #989
pulsar_parameter_estimation_nested: minor fix in the check for whether we are dealing with a biaxial star model
FileIO: new API functions XLALFileIsRegular(), XLALFileSize() and XLALFileIsRegularAndGetSize()

  - checks whether input file-path is a 'regular' file (rather than
    a directory or sth else), and returns its length
  - refs #1125
FileIO: new API functions XLALFileResolvePath[Long](fname)

   - performs file-resolving magic similar to the legacy LALOpenDataFile(),
     returns successfully resolved file-path if found
   - refs #1088
FileIO: new API function XLALFileLoad() to load an entire file into memory

   - handles normal and gzipped files transparently
   - faster than XLALCHARReadSequence()
   - refs #1138
added FileIOTest code for testing and timing file-parsing functions

   - compares reading a large compressed ephemeris file either using
     XLALCHARReadSequence() or XLALFileLoad(),
     and also provides speed-comparison
   - output timing info also on XLALCreateTokenList() and
     XLALParseDataFile()
   - refs #1138