gnu: r-ksamples: Update to 1.2-7.

* gnu/packages/cran.scm (r-ksamples): Update to 1.2-7.

gnu: r-distillery: Update to 1.0-4.

* gnu/packages/cran.scm (r-distillery): Update to 1.0-4.

gnu: r-sp: Update to 1.2-5.

* gnu/packages/cran.scm (r-sp): Update to 1.2-5.

gnu: r-ggally: Update to 1.3.2.

* gnu/packages/cran.scm (r-ggally): Update to 1.3.2.

gnu: r-reshape: Update to 0.8.7.

* gnu/packages/cran.scm (r-reshape): Update to 0.8.7.

gnu: r-powerlaw: Update to 0.70.1.

* gnu/packages/cran.scm (r-powerlaw): Update to 0.70.1.

gnu: r-circlize: Update to 0.4.1.

* gnu/packages/cran.scm (r-circlize): Update to 0.4.1.

gnu: r-shape: Update to 1.4.3.

* gnu/packages/cran.scm (r-shape): Update to 1.4.3.

gnu: r-tclust: Update to 1.3-1.

* gnu/packages/statistics.scm (r-tclust): Update to 1.3-1.

gnu: r-fastcluster: Update to 1.1.24.

* gnu/packages/statistics.scm (r-fastcluster): Update to 1.1.24.

gnu: r-rcpparmadillo: Update to 0.7.960.1.2.

* gnu/packages/statistics.scm (r-rcpparmadillo): Update to 0.7.960.1.2.

gnu: r-plotrix: Update to 3.6-6.

* gnu/packages/statistics.scm (r-plotrix): Update to 3.6-6.

gnu: r-httr: Update to 1.3.1.

* gnu/packages/statistics.scm (r-httr): Update to 1.3.1.
[propagated-inputs]: Remove r-digest and r-stringr.

gnu: r-commonmark: Update to 1.4.

* gnu/packages/statistics.scm (r-commonmark): Update to 1.4.

gnu: r-ade4: Update to 1.7-8.

* gnu/packages/statistics.scm (r-ade4): Update to 1.7-8.

gnu: r-tibble: Update to 1.3.4.

* gnu/packages/statistics.scm (r-tibble): Update to 1.3.4.

gnu: r-rlang: Update to 0.1.2.

* gnu/packages/statistics.scm (r-rlang): Update to 0.1.2.

gnu: r-knitr: Update to 1.17.

* gnu/packages/statistics.scm (r-knitr): Update to 1.17.

gnu: r-bh: Update to 1.65.0-1.

* gnu/packages/statistics.scm (r-bh): Update to 1.65.0-1.

gnu: r-scales: Update to 0.5.0.

* gnu/packages/statistics.scm (r-scales): Update to 0.5.0.
[propagated-inputs]: Add r-r6 and r-viridislite.