Merge branch 'develop' into e2e_backups

.circleci/config.yml

.dockerignore

.travis.yml

CHANGES.md

CONTRIBUTING.rst

MANIFEST.in

changelog.d/3659.feature

changelog.d/3673.misc

changelog.d/3680.feature

changelog.d/3722.bugfix

changelog.d/3724.feature

changelog.d/3726.misc

changelog.d/3727.misc

changelog.d/3734.misc

changelog.d/3735.misc

changelog.d/3746.misc

changelog.d/3747.bugfix

changelog.d/3749.feature

changelog.d/3751.feature

changelog.d/3753.bugfix