gnu: Add Pfff.
* gnu/packages/textutils.scm (pfff): New variable.
gnu: Add genomation.
* gnu/packages/bioinformatics.scm (r-genomation): New variable.
gnu: Add seqPattern.
* gnu/packages/bioinformatics.scm (r-seqpattern): New variable.
gnu: Add impute.
* gnu/packages/bioinformatics.scm (r-impute): New variable.
gnu: Add BSgenome.
* gnu/packages/bioinformatics.scm (r-bsgenome): New variable.
gnu: Add plotly.
* gnu/packages/statistics.scm (r-plotly): New variable.
gnu: Add viridis.
* gnu/packages/statistics.scm (r-viridis): New variable.
gnu: Add topGO.
* gnu/packages/bioinformatics.scm (r-topgo): New variable.
gnu: Add matrixStats.
* gnu/packages/statistics.scm (r-matrixstats): New variable.
gnu: Add R.rsp.
* gnu/packages/statistics.scm (r-r-rsp): New variable.
gnu: Add R.cache.
* gnu/packages/statistics.scm (r-r-cache): New variable.
gnu: Add R.utils.
* gnu/packages/statistics.scm (r-r-utils): New variable.
gnu: Add R.oo.
* gnu/packages/statistics.scm (r-r-oo): New variable.
gnu: Add R.methodsS3.
* gnu/packages/statistics.scm (r-r-methodss3): New variable.
gnu: Add base64enc.
* gnu/packages/statistics.scm (r-base64enc): New variable.
gnu: Add DT.
* gnu/packages/statistics.scm (r-dt): New variable.
gnu: Add SparseM.
* gnu/packages/statistics.scm (r-sparsem): New variable.
gnu: Add GO.db.
* gnu/packages/bioinformatics.scm (r-go-db): New variable.
gnu: Add GenomicFeatures.
* gnu/packages/bioinformatics.scm (r-genomicfeatures): New variable.