Templating : return __empty__ value when all value return nothing to prevent elasticsearch syntaxe error (#9701)

decrease length of auth_id column in user_auth table

* ldap: case-insensitive LDAP group comparison

According to RFC2251 4.1.5, LDAP strings are case-insensitive. Disregard case when comparing group mappings.

* ldap: add test for case-insensitive group mapping

[skip ci]

fix XSS vulnerabilities in dashboard links

Merge branch 'feature/save_json' of https://github.com/jereksel/grafana into jereksel-feature/save_json

This reverts commit 34133671.

certain mysql versions don't support having indices with a greater varchar length
than 190.

Support for local Docker builds

Merge branch 'am/fix-query-variable-influxdb' of https://github.com/forzafootball/grafana into influx-db-select-query-variable

* Add baron scroller to grafana panel, not plugin panel

* remove comment about root <div> element, since it will not be true

* enable url() processing in CSS to ensure assets load in HMR mode
* only needed when running `yarn start` which needs this for the hot
reloader

Server shutdown flow rewrite & provision service refactor

Explore: Add entry to panel menu to jump to Explore

* fix root_url in docs & comments

* include ports in docker-compose config

add notes about closing #11743 and add release data for 5.1.1
[skip ci]

* add a git-ignored `local/` folder for Makefile/Dockerfile
* import `local/Makefile` to root Makefile
* add `.dockerignore`

* fix: initial cleanup and implementation

* feat: finish special character escaping

* feat: updates fileExport to generate RFC-4180 compliant CSV

* chore: replace html decoder with the lodash version and final cleanup

* fix: restore character html decoding