Fix a bug in MPI sending of doublebeam, add some more HDF5 outputs.

* The min/max values for the beam components were being sent
  as UNSIGNED when they should have been sent as DOUBLE.  This
  caused some very subtle real-world problems in fits.
* Add a test of this to mpi_copy_test.
* Added beam summary output to stream for doublebeam as part of
  debugging.
* Some additional information about the R ranges, etc. is output
  to HDF5 in calcLikeDoubleSingle.
* Other minor formatting things.