Merge branch 'master' into staging

Makefile.am

doc/build.scm

doc/guix.texi

etc/guix-install.sh

gnu/local.mk

gnu/packages/algebra.scm

gnu/packages/bioconductor.scm

gnu/packages/bioinformatics.scm

gnu/packages/bootloaders.scm

gnu/packages/chromium.scm

gnu/packages/databases.scm

gnu/packages/disk.scm

gnu/packages/education.scm

gnu/packages/emacs-xyz.scm

gnu/packages/gnome.scm

gnu/packages/gnunet.scm

gnu/packages/gps.scm

gnu/packages/linux.scm

gnu/packages/llvm.scm

gnu/packages/music.scm