gnu: r-forcats: Update to 0.3.0.

* gnu/packages/statistics.scm (r-forcats): Update to 0.3.0.
[propagated-inputs]: Add r-rlang.

gnu: r-xml: Update to 3.98-1.10.

* gnu/packages/statistics.scm (r-xml): Update to 3.98-1.10.
[inputs]: Add zlib.
[native-inputs]: Add pkg-config.

gnu: r-devtools: Update to 1.13.5.

* gnu/packages/statistics.scm (r-devtools): Update to 1.13.5.

gnu: r-dbplyr: Update to 1.2.1.

* gnu/packages/statistics.scm (r-dbplyr): Update to 1.2.1.

gnu: r-rlang: Update to 0.2.0.

* gnu/packages/statistics.scm (r-rlang): Update to 0.2.0.

gnu: r-knitr: Update to 1.20.

* gnu/packages/statistics.scm (r-knitr): Update to 1.20.

gnu: r-stringr: Update to 1.3.0.

* gnu/packages/statistics.scm (r-stringr): Update to 1.3.0.
[propagated-inputs]: Add r-glue.

gnu: r-pryr: Update to 0.1.4.

* gnu/packages/statistics.scm (r-pryr): Update to 0.1.4.

gnu: r-bh: Update to 1.66.0-1.

* gnu/packages/statistics.scm (r-bh): Update to 1.66.0-1.

gnu: r-nlme: Update to 3.1-131.1.

* gnu/packages/statistics.scm (r-nlme): Update to 3.1-131.1.

Merge branch 'master' into core-updates

gnu: r-lubridate: Update to 1.7.2.

* gnu/packages/statistics.scm (r-lubridate): Update to 1.7.2.

gnu: r-ranger: Update to 0.9.0.

* gnu/packages/statistics.scm (r-ranger): Update to 0.9.0.

gnu: r-lme4: Update to 1.1-15.

* gnu/packages/statistics.scm (r-lme4): Update to 1.1-15.

gnu: r-quantreg: Update to 5.35.

* gnu/packages/statistics.scm (r-quantreg): Update to 5.35.

gnu: r-rcppeigen: Update to 0.3.3.4.0.

* gnu/packages/statistics.scm (r-rcppeigen): Update to 0.3.3.4.0.

gnu: r-pbapply: Update to 1.3-4.

* gnu/packages/statistics.scm (r-pbapply): Update to 1.3-4.

gnu: r-vgam: Update to 1.0-5.

* gnu/packages/statistics.scm (r-vgam): Update to 1.0-5.

gnu: r-fpc: Update to 2.1-11.

* gnu/packages/statistics.scm (r-fpc): Update to 2.1-11.

gnu: r-pcapp: Update to 1.9-73.

* gnu/packages/statistics.scm (r-pcapp): Update to 1.9-73.