This is a pre-requisite for uploading inline images.

Fixes #10472

* dashboard: repeat rows and panels tests

* fix variable values passing when both repeat rows and panels is used

* Add eu-west-3 as a possible default datasource

* Add eu-west-3 as a possible default datasource

* poc: Use react-popper for tooltips #10389

* poc: Add popover component and use a hoc() for Tooltip + Popover to avoid code duplication #10389

* jest: Add snapshot tests to Popover and Tooltip #10389

* poc: Move target from hoc into Popover/Tooltip-component #10389

* poc: Clean up unused styles and use the existing Grafana style/colors on popper tooltip #10389

* poc: Remove test code before PR

* poc: Remove imports used in poc but shouldn't be included anymore #10389

* ux: When adding a new panel we should scroll to top until we figure out a better solution #10299

* ux: Use jquery to add smooth scrolling when scrolling up to add a panel, and make sure to pass the scope to the event emitter, #10299

* ux: Add a close button to the "New panel"-box and make sure you scroll to top every time you click "Add panel" #10299

Incorrect return values in onbeforeunload event handler mean that the
unsaved changes popup is shown despite there being no changes.

* Add nginx proxy docker container

Ease test/verification of running Grafana thru a reverse proxy

* Add apache proxy docker container

Ease test/verification of running Grafana thru a reverse proxy

* Fix relative urls for reset password page

* Fix relative urls for signup page

* Fix relative urls for login page

* Fix relative urls edit plugin page

Fixed the subUrl bugs for folder/settings/teams etc. with root_url modified

fixed the subUrl bugs from https://community.grafana.com/t/suburl-not-work-at-some-links-and-buttons/4701 with folder/settings/teams etc.