Version 3.20.10 for Hyrax 1.16.5

Requires libdap-3.20.9

DMR++ Improvements

• Added support for the HDF5 filter Fletcher32 to the dmr++ creation and
  processing code.

• Implemented lazy evaluation of dmr++ files. This change greatly
  improves efficiency/speed for requests that subset a dataset that
  contains a large number of variables as only the variables requested
  will have their Chunk information read and parsed.

• Added version and configuration information to dmr++ files built using
  the build_dmrpp and get_dmrpp applications. This will enable people to
  recreate and understand the conditions which resulted in a particular
  dmr++ instance. This also includes a -z switch for get_dmrpp which
  will return its version.

• Performance improvement: By patching Chunk::add_tracking_query_param() so
  that it doesn't do anything if no parameter is submitted we eliminated a
  very time costly regular expression evaluation that was being performed
  during the read operation for every Chunk. This improved read performance
  by a factor of 2-3 orders of magnitude!

Handler Updates

• Added new netcdf_handler configuration parameter:
  NC.PromoteByteToShort
  Which, when set to true will cause signed 8-bit
  integer values to be promoted to Int16 (Because the DAP2 data
  model does not support signed 8-bit integers)

• By default the NetCDF Fileout feature will ship with
  FONc.ClassicModel=false

• Added new configuration option to the HDF5 handler:
  EnableCFDMR=true which will allow the generation of CF compliant DMR output.

General Housekeeping

• Code organization changes to facilitate development
  and compilation on different platforms.
  • Moved functions into modules directory
  • Improved Test scripts to handle version string updates.
  • Changed libdap include paths to "libdap/*.h" to prevent
    include file collisions.
  • Started migrating to C++11 regex implementation (away from
    older less efficient GNU implementation) This is controlled
    by a compile time switch for now.