gnu: r-pbapply: Update to 1.3-3.

* gnu/packages/statistics.scm (r-pbapply): Update to 1.3-3.

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

* gnu/packages/statistics.scm (r-vgam): Update to 1.0-4.

gnu: r-mclust: Update to 5.3.

* gnu/packages/statistics.scm (r-mclust): Update to 5.3.

gnu: r-flexmix: Update to 2.3-14.

* gnu/packages/statistics.scm (r-flexmix): Update to 2.3-14.

gnu: r-fastica: Update to 1.2-1.

* gnu/packages/statistics.scm (r-fastica): Update to 1.2-1.

gnu: r-cowplot: Update to 0.8.0.

* gnu/packages/statistics.scm (r-cowplot): Update to 0.8.0.

gnu: r-rann: Update to 2.5.1.

* gnu/packages/statistics.scm (r-rann): Update to 2.5.1.

gnu: r-statmod: Update to 1.4.30.

* gnu/packages/statistics.scm (r-statmod): Update to 1.4.30.

gnu: r-gdata: Update to 2.18.0.

* gnu/packages/statistics.scm (r-gdata): Update to 2.18.0.

gnu: r-sfsmisc: Update to 1.1-1.

* gnu/packages/statistics.scm (r-sfsmisc): Update to 1.1-1.

gnu: r-googlesheets: Update to 0.2.2.

* gnu/packages/statistics.scm (r-googlesheets): Update to 0.2.2.

gnu: r-tidyr: Update to 0.6.3.

* gnu/packages/statistics.scm (r-tidyr): Update to 0.6.3.

gnu: r-glmnet: Update to 2.0-10.

* gnu/packages/statistics.scm (r-glmnet): Update to 2.0-10.

gnu: r-irlba: Update to 2.2.1.

* gnu/packages/statistics.scm (r-irlba): Update to 2.2.1.

gnu: r-sparsem: Update to 1.77.

* gnu/packages/statistics.scm (r-sparsem): Update to 1.77.

gnu: r-segmented: Update to 0.5-2.1.

* gnu/packages/statistics.scm (r-segmented): Update to 0.5-2.1.

gnu: r-xml: Update to 3.98-1.9.

* gnu/packages/statistics.scm (r-xml): Update to 3.98-1.9.

gnu: r-rmarkdown: Update to 1.6.

* gnu/packages/statistics.scm (r-rmarkdown): Update to 1.6.

gnu: r-rcpparmadillo: Update to 0.7.900.2.0.

* gnu/packages/statistics.scm (r-rcpparmadillo): Update to 0.7.900.2.0.

gnu: r-plotrix: Update to 3.6-5.

* gnu/packages/statistics.scm (r-plotrix): Update to 3.6-5.