Lens library updated to v4.4

also passes tests again, so doCheck is not needed
Add lens-aeson library, lens 4.4 split all aeson functionality to here
jailbreak cabal-lens so that it builds with lens v4.4

bug report submitted to cabal-lens to request upper bound bump
Merge pull request #3718 from MP2E/lens_4_4_update

bump haskellPackages.lens to 4.4, introduced haskellPackages.lensAeson.
Revert "Merge pull request #3718 from MP2E/lens_4_4_update"

This reverts commit 53fab4004e171a3490842c921abd8551a73278b1, reversing
changes made to 08e4d586009768e0f2a874125ac618424703b7f5.
Build a few NixOS system closures on Hydra

This will allow us to keep track of the evolution of closure sizes of
some typical configurations. (Hydra stores closure sizes in its
database.)
Fix various evaluation problems

http://hydra.nixos.org/build/13616685
linphone: mark as broken for ZHF
Revert "Revert "Merge pull request #3718 from MP2E/lens_4_4_update""

This reverts commit fec81c392f255fed231d13e9ca363632648a05c5.