[PATCH v1]: gnu: Add R.

[Ricardo Wurmus]

Hi Guix,

attached is a patch to add the statistics software R.

The test suite fails when using `guix build' but it's passing when run
in `guix environment --pure r' (where LANG is "en_GB.UTF-8").  Judging
from the error message I suspect that the failure is locale-related, but
I was not able to fix this by adding a build phase before `check'.

Do you have any ideas how to fix the test suite?

The patch also includes the definition of a new mirror for the R package
repository CRAN.

~~ Ricardo

0001-gnu-Add-R.patch
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