Added package r version 3.4.3 (#6565)
Added package r version 3.4.3 (#6565)


EmreAtes/spack,krafczyk/spack,tmerrick1/spack,mfherbst/spack,mfherbst/spack,LLNL/spack,EmreAtes/spack,mfherbst/spack,matthiasdiener/spack,EmreAtes/spack,tmerrick1/spack,LLNL/spack,iulian787/spack,tmerrick1/spack,matthiasdiener/spack,krafczyk/spack,krafczyk/spack,iulian787/spack,krafczyk/spack,mfherbst/spack,krafczyk/spack,iulian787/spack,LLNL/spack,matthiasdiener/spack,matthiasdiener/spack,EmreAtes/spack,iulian787/spack,mfherbst/spack,LLNL/spack,EmreAtes/spack,iulian787/spack,LLNL/spack,matthiasdiener/spack,tmerrick1/spack,tmerrick1/spack