v2.43 release

Tag for next release

v2.42, to fix stage

v2.42-stage

Create new tag to update stage to a version with all the necessary sc…

v2.42

Tag for next release.

v2.41

Tag for next release.

v2.41 again, for infra reasons

v2.41-real

bug 1400141: Improve History.getChange efficiency. (#419). r=catlee