gnu: i2c-tools: Update source and home-page URLs.
* gnu/packages/linux.scm (i2c-tools)[source]: Update URL.
[home-page]: Update URL.
gnu: lm-sensors: Update source and home-page URLs.
* gnu/packages/linux.scm (lm-sensors)[source]: Update URL.
[home-page]: Update URL.
gnu: nss: Update to 3.21 [fixes CVE-2015-7575].
* gnu/packages/gnuzilla.scm (nss): Update to 3.21.
[arguments]: In configure phase, setenv CC=gcc.
* gnu/packages/patches/nss-pkgconfig.patch: Adapt to NSS 3.21.
gnu: Add missing (gnu packages gcc) import.
* gnu/packages/bioinformatics.scm: Use (gnu packages gcc). This is
required by 'r-impute' for 'gfortran'.
gnu: xterm: Update to 322.
* gnu/packages/xorg.scm (xterm): Update to 322.
gnu: epiphany: Update to 3.18.2.
* gnu/packages/gnome.scm (epiphany): Update to 3.18.2.
gnu: webkitgtk: Update to 2.10.4.
* gnu/packages/webkit.scm (webkitgtk): Update to 2.10.4.
gnu: Add Pfff.
* gnu/packages/textutils.scm (pfff): New variable.
gnu: Add genomation.
* gnu/packages/bioinformatics.scm (r-genomation): New variable.
gnu: Add seqPattern.
* gnu/packages/bioinformatics.scm (r-seqpattern): New variable.
gnu: Add impute.
* gnu/packages/bioinformatics.scm (r-impute): New variable.
gnu: Add BSgenome.
* gnu/packages/bioinformatics.scm (r-bsgenome): New variable.
gnu: Add plotly.
* gnu/packages/statistics.scm (r-plotly): New variable.
gnu: Add viridis.
* gnu/packages/statistics.scm (r-viridis): New variable.
gnu: Add topGO.
* gnu/packages/bioinformatics.scm (r-topgo): New variable.
gnu: Add matrixStats.
* gnu/packages/statistics.scm (r-matrixstats): New variable.
gnu: Add R.rsp.
* gnu/packages/statistics.scm (r-r-rsp): New variable.
gnu: Add R.cache.
* gnu/packages/statistics.scm (r-r-cache): New variable.
gnu: Add R.utils.
* gnu/packages/statistics.scm (r-r-utils): New variable.