(devel/netcdf-cxx) Updated 4.2 to 4.3.1

\Brief Release notes file for the netcdf-cxx4 package.

This file contains a high-level description of this package's
evolution. Releases are in reverse chronological order (most recent
first).

Note that this file was created and maintained starting with the `netcdf-cxx4 4.3.0 release`.

## netCDF-CXX4 4.3.2 TBD

## netCDF-CXX4 v4.3.1 September 11, 2019

### Requirements

* netCDF-C 4.6.0 or greater

### Changes

* [Enhancement] Added cmake support to distribution files created by `make dist`.

* [Bug Fix] Added `ncFile::create()`, also added a new `open` function
  and constructor to allow for more flexibility when opening a file.
  See [GitHub #55](https://github.com/Unidata/netcdf-cxx4/issues/55)
  for more information.

* [Enhancement] Addressed an issue reported with `Intel Compilers
  17.0.0`. See [GitHub
  #41](https://github.com/Unidata/netcdf-cxx4/issues/41) for more
  information.

* [Enhancement] Updated how `configure` determines information about
  the existing netCDF-C install.  See [GitHub pull request
  #39](https://github.com/Unidata/netcdf-cxx4/pull/39) for more
  information.

* Corrected an issue where cmake-based builds weren't generating
  `ncxx4-config`.  See [GitHub pull request
  #37](https://github.com/Unidata/netcdf-cxx4/pull/37) for more
  information.

## netcdf-cxx4 v4.3.0 released May 13, 2016

* Fixed an issue where the tests were failing silently, and the
  underlying `NcType` class could not properly determine the type name
  or type size reliably. See [GitHub issue
  #30](https://github.com/Unidata/netcdf-cxx4/issues/30) for more
  information.

* Changed `NCXX_ENABLE_DOXYGEN` option to an easier-to-remember `ENABLE_DOXYGEN`.

* Added `--enable-doxygen`, `-DNCXX_ENABLE_DOXYGEN=ON` options to
  allow generation of netCDF-CXX4 documentation via doxygen using
  either `configure` or `cmake`, respectively.

* Added `netcdf-cxx4` to the [Coverity Scan
  Dashboard](https://scan.coverity.com/projects/unidata-netcdf-cxx4?tab=overview).

* Added `open` and `close` methods for NcFile.  See [Github Pull
  Request #18](https://github.com/Unidata/netcdf-cxx4/pull/18) for
  more information.

* Added `netcdf-cxx4` to travis-ci.org.  See
  [https://travis-ci.org/Unidata/netcdf-cxx4](https://travis-ci.org/Unidata/netcdf-cxx4)
  for more details.

* Added `NcCompoundType` methods `getMemberName` and `getMemberIndex`.
  See [Pull Request
  #19](https://github.com/Unidata/netcdf-cxx4/pull/19) for more
  details.

* Added  `cmake` support  to  `netcdf-cxx4`, which  will  allow us  to
  create a  `CDash` continuous integration dashboard  similar to those
  created for the `netcdf-c` and `netcdf-fortran` projects.

* Added a `travis-ci` configuration file, `.travis.yml`.

* Created `RELEASE_NOTES.md`.


(mef)