profiles: Build GTK+ input module cache.

* guix/profiles.scm (gtk-im-modules): New procedure.
(%default-profile-hooks): Add it.

profiles: manifest-lookup-package: Optionally match version prefix.

* guix/profiles.scm (manifest-lookup-package): Optionally filter store
item matches by version prefix.

gnu: Add r-txdb-hsapiens-ucsc-hg19-knowngene.

* gnu/packages/bioinformatics.scm (r-txdb-hsapiens-ucsc-hg19-knowngene):
  New variable.

gnu: Add r-grohmm.

* gnu/packages/bioinformatics.scm (r-grohmm): New variable.

gnu: Add r-systempiper.

* gnu/packages/bioinformatics.scm (r-systempiper): New variable.

gnu: Add r-shortread.

* gnu/packages/bioinformatics.scm (r-shortread): New variable.

gnu: Add r-gostats.

* gnu/packages/bioinformatics.scm (r-gostats): New variable.

gnu: Add r-category.

* gnu/packages/bioinformatics.scm (r-category): New variable.

gnu: Add r-gseabase.

* gnu/packages/bioinformatics.scm (r-gseabase): New variable.

gnu: Add r-rbgl.

* gnu/packages/bioinformatics.scm (r-rbgl): New variable.

gnu: Add r-annotationforge.

* gnu/packages/bioinformatics.scm (r-annotationforge): New variable.

gnu: Add r-batchjobs.

* gnu/packages/statistics.scm (r-batchjobs): New variable.

gnu: Add r-fail.

* gnu/packages/statistics.scm (r-fail): New variable.

gnu: Add r-bbmisc.

* gnu/packages/statistics.scm (r-bbmisc): New variable.

gnu: Add r-checkmate.

* gnu/packages/statistics.scm (r-checkmate): New variable.

gnu: Add r-backports.

* gnu/packages/statistics.scm (r-backports): New variable.

gnu: Add r-sendmailr.

* gnu/packages/statistics.scm (r-sendmailr): New variable.

gnu: Add r-pheatmap.

* gnu/packages/statistics.scm (r-pheatmap): New variable.

gnu: Add r-matrix.

* gnu/packages/statistics.scm (r-matrix): New variable.

gnu: Add r-deseq2.

* gnu/packages/bioinformatics.scm (r-deseq2): New variable.