Arvados

The build scripts have been updated; I merged that change into master. I tested the package build and test locally and it all works.

I've also updated the build pipeline in Jenkins; we'll see if that works out when this commit builds (or not).

I've prepared the documentation update in branch 10988-document-ubuntu1604-support. We should hold off merging that until we're confident that an installation based on ubuntu1604 actually functions.