Merge branch 'core-updates'

diff --cc gnu/packages/emacs-xyz.scm
Simple merge

diff --cc gnu/packages/engineering.scm
Simple merge

diff --cc gnu/packages/games.scm
Simple merge

diff --cc gnu/packages/graphics.scm
Simple merge

diff --cc gnu/packages/linux.scm
Simple merge

diff --cc gnu/packages/maths.scm
Simple merge

diff --cc gnu/packages/perl.scm
Simple merge