Log Message:
(math/R-RNetCDF) Updated 1.9.1 to 2.4.2

Version 2.4-2, 2020-09-12
  * Support reading/writing special values (e.g. NA, Inf) without substitution,
    mainly in cases where type conversion between R and NetCDF is not required.
  * Fix selection of na.mode values 0,1,2
  * Fix range checks for numeric conversions with packing
  * Significantly increase test coverage of type conversion routines
  * Support parallel NetCDF when running with MPI
  * Allow creation of datasets in "data64" (CDF5) format
  * Support diskless files and in-memory manipulation of persistent files

Version 2.3-1, 2020-04-27
  * Fix problem when defining scalar variables with netcdf-4.7.4

Version 2.1-1, 2019-10-18
  * Remove automatic handling of fill values in user-defined types
  * Link rwinlib libraries by pathname to fix r-hub Windows builds
  * Correct quoting of external software names in DESCRIPTION

Version 2.0-4, 2019-10-13
  * Fix OSX packages by linking expat library

Version 2.0-3, 2019-10-05
  * Support NetCDF-4 features for reading and writing of datasets.
  * Suggest bit64 package for NC_INT64 and NC_UINT64 types.
  * Drop support for netcdf-3.x library, require netcdf-4.x.
  * Drop support for udunits-1 library.
  * Disable calendar functions if udunits-2.x is not found during build.