settings(change): changed default value for allow sign up to false, closes #8743, and changed default option allow_org_create to false

Fixes #8870. Fixes out of bound exception on adding a math query part
when there is no group by interval (or only one query part).

There are three locations where the `docker run` command is referenced:
- 2x http://docs.grafana.org/installation/docker/
- 1x https://grafana.com/grafana/download?platform=docker

The fix syncs the given `docker run` command arguments with the other two.

* panel-alertlist: use dashboard timezone, fixes #8874

* alert state history: use dashboard timezone, issue #8874

* alert state history: minor refactor

* (prometheus) set focus to top expression when opening editor

* (text panel) set focus to top expression when opening editor

* table-panel: clickable cell link - draft

* table-panel: clickable cell link - fix link target option

* table-panel: fix undefined columnStyle.link

* table-panel: option to highlight cell with link

* table-panel: render variables for all cells in row

* table-panel: remove cell highlighting

* table-panel: add help for URL field

* linkPopover directive for link info in table panel

* table-panel: add link info popover to cells

* table-panel: use native popover instead directive

* table-panel: link drop refactor, remove unused code

* table-panel: fix unclickable link when drop is opened

* refactoring: minor refactoring to #8738, do not think we need a full blown popover for the links, simple tooltip is enough and more efficient, sadly we do not have a modern tooltip framework, still using old bootstrap 2.3 tooltip

* table-panel: add tests for link rendering

* add benchmark

* fix, prevent plotLineArea() call if fill == 0

* remove benchmark

fixes https://github.com/grafana/grafana/issues/8840
by setting a default locale. Also uses fromNow(true) to work arround the replace.

* Interpolate the field property in elastic search term queries

* more defensive interpolation of query.field in ES templates

Fixes #8750.

This should close the bug #8773

When converting Prometheus results to table, handle the case where the returned series have non-uniform sets of labels. (#8826)