* support [[var]] form in cloudwatch datasource

* support multi variable in single dimension

* fix test

ref #1613

to make sure an user opens the dashboard in the correct org, orgId will
always be added when sharing a dashboard. if the users current orgId
doesnt match the query parameter grafana will change it and redirect the
user.

closes #1613

alerting: dedupe alert notifications when running multiple servers

For data source template variables, check if the
selected value is default and if so load the
default data source.

Fixes #7586

alert notifications will only be sent if the database value
is updated.

ref #6957

ref #7469. Description of new route that
adds paging for the users list.

Add documentation for 'external_image_storage.s3' to explain how to specify the AWS region for the S3 bucket, and the requires S3/IAM permissions.

This reverts commit 99f1c300.

the org redirecter opened the body stream by misstake. Causing
downstream code to start reading from an empty stream and raise errors.

middlware: change org when url contains orgid

closes #6948
ref #1613