[ncl-install] Fix for NCL conda installation errors

[Kevin Hallock]

Hi everyone,

We’ve recently received numerous reports that our conda installation instructions <http://ncl.ucar.edu/Download/conda.shtml> are resulting in an “UnsatisfiableError” when trying to install NCL.

The good news is that we've found a workaround for this issue:
conda create -n ncl_fix -c conda-forge -c conda-forge/label/broken ncl poppler=0.52 xerces-c=3.1 gsl

The (potentially) bad news is that this workaround requires a “broken” version of the GDAL/libgdal dependency to be installed alongside NCL, which may break compatibility with other conda packages. If no other conda packages are installed in the conda environment containing NCL (“ncl_fix” in the example command above), then this should not be an issue.

If anyone tries this workaround and continues to experience problems installing or running NCL via conda, please let us know.

Thanks!
Kevin
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