* 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)

Adds pragma and expires headers for API calls so that IE11 does not
cache GET calls. Ref #5356

"Metric Lookup" row in Query editor was broken :(

If a dashboard has a null value for updated_by then the migration
for the dashboard version table fails. This change uses coalesce to
set -1 instead of null when inserting into the created_by column
which has a non-null constraint. Fixes #8783.