Hi,

I'm submitting these packages on behalf of Nextjournal
(https://nextjournal.com). I packaged them originally a few months ago
and recently updated them for submitting to GNU Guix.

gnu: Add flatbuffers.
gnu: Add python-plotly.
gnu: Add r-maps.
gnu: Add r-mapproj.
gnu: Add Rgooglemaps.
gnu: Add r-geosphere.
gnu: Add r-subplex.
gnu: Add r-desolve.
gnu: Add Diversitree.
gnu: Add r-jpeg.
gnu: Add r-ggmap.
gnu: Add r-feather.
gnu: Add google-brotli.
gnu: Add apache-arrow.
gnu: Add python-pyarrow.
gnu: Add python-feather-format.