Merge branch 'master' into core-updates

gnu: linux-libre: Update to 4.15.3.

* gnu/packages/linux.scm (%linux-libre-version): Update to 4.15.3.
(%linux-libre-hash): Update hash.

gnu: linux-libre@4.14: Update to 4.14.19.

* gnu/packages/linux.scm (%linux-libre-4.14-version): Update to 4.14.19.
(%linux-libre-4.14-hash): Update hash.

gnu: linux-libre@4.9: Update to 4.9.81.

* gnu/packages/linux.scm (linux-libre-4.9): Update to 4.9.81.

gnu: r-htmltable: Update to 1.11.2.

* gnu/packages/web.scm (r-htmltable): Update to 1.11.2.
[propagated-inputs]: Remove r-dplyr and r-tidyr.

gnu: r-htmlwidgets: Update to 1.0.

* gnu/packages/web.scm (r-htmlwidgets): Update to 1.0.

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.

gnu: r-zoo: Update to 1.8-1.

* gnu/packages/statistics.scm (r-zoo): Update to 1.8-1.

gnu: r-hmisc: Update to 4.1-1.

* gnu/packages/statistics.scm (r-hmisc): Update to 4.1-1.

gnu: r-tidyr: Update to 0.8.0.

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

gnu: r-viridislite: Update to 0.3.0.

* gnu/packages/statistics.scm (r-viridislite): Update to 0.3.0.

gnu: r-viridis: Update to 0.5.0.

* gnu/packages/statistics.scm (r-viridis): Update to 0.5.0.