Merge branch 'master' into core-updates

Makefile.am

doc/guix.texi

gnu-system.am

gnu/build/install.scm

gnu/packages/admin.scm

gnu/packages/audacity.scm

gnu/packages/audio.scm

gnu/packages/bioinformatics.scm

gnu/packages/check.scm

gnu/packages/code.scm

gnu/packages/databases.scm

gnu/packages/gl.scm

gnu/packages/gnome.scm

gnu/packages/gnuzilla.scm

gnu/packages/graphics.scm

gnu/packages/ibus.scm

gnu/packages/image.scm

gnu/packages/linux.scm

gnu/packages/lirc.scm

gnu/packages/maths.scm