routing: allows routes to be added to existing groups

this enables services to add routing to ex /api
without causing conflicts.

[skip ci]

enhance error message if phantomjs executable is not found

if arm build, explain that phantomjs is not included by default in arm
builds. If not explain that phantom js isn't installed correctly

[skip ci]

Fix selecting current dashboard from search does not reload dashboard

* fix delete annotations

* fix self assignment

* add right unit test using admin role

Fixing wrong /public path, relative to the webpack.dev script, that would avoid webpack from cleaning previous builds. (#12351)

[skip ci]

Set $rootScope in DatasourceSrv

Return a 404 when deleting a datasource through the API if it doesn't…

Return a 404 when deleting a datasource through the API if it doesn't exist and add a test for it to confirm #12313

fix "Cloudwatch panel does not allow arbitrary variable values in query"

Karma to Jest: history_ctrl

Pass configured/auth headers to a Datasource.

In some setups (ex openshift), the Datasource will require Grafana
to pass oauth token as header when sending queries.
Also, this PR allow to send any header which is something
Grafana currently does not support.

Conditionally select a field to return in ResponseParser for InfluxDB

Fix error in InfluxDB query

[skip ci]

build: fix signing of multiple rpm packages

[skip ci]

https://github.com/grafana/grafana-docker/issues/170
[skip ci]

[skip ci]

[skip ci]

[skip ci]

Make sure to process panels in collapsed rows when exporting dashboard

[skip ci]

graph: fix legend decimals precision calculation