Auth Proxy improvements - adds the option to use ldap groups for authorization in combination with an auth proxy - adds an option to limit where auth proxy requests come from by configure a list of ip's - fixes a security issue, session could be reused

- adds the option to use ldap groups for authorization in combination with an auth proxy
- adds an option to limit where auth proxy requests come from by configure a list of ip's
- fixes a security issue, session could be reused

fix 6749 by swapping member in StandardGauge to avoid problem with atomic

typo?

Added Hidden Column Style for Table Panel

Cloudwatch configurable keys from config page.

New aggregation on singlestat panel

generalized database connection cert support and added to postgres

[5443] Check if title is empty before save a new dashboard

[6679] Check if org exists before delete it

Signed-off-by: Dirk le Roux <dirk.leroux@gmail.com>

Signed-off-by: Dirk le Roux <dirk.leroux@gmail.com>

* fix(table): renderes empty date column as '-'

closes #6728

* docs(changelog): add note about closing 6728