Prepended first line to export file containing
`sep=;\n`
which I believe should be all that is required for Excel to interpret the CSV file as semicolon delimited.

Merge branch 'cancel-in-flight-repeats' of https://github.com/stuartnelson3/grafana into stuartnelson3-cancel-in-flight-repeats

Conflicts:
	conf/defaults.ini
	pkg/setting/setting.go
	public/app/core/components/grafana_app.ts
	public/app/core/core.ts
	public/app/features/dashboard/dashboardCtrl.js

feat(graph): graph tooltip sort order PR refactored/changed #4944, changed the layout graph display options, #4944

Implemented nested template variables functionality for Opentsdb

Due to a bug in golang the 64bit variable i
need to come first to be 64bit aligned.
https://golang.org/pkg/sync/atomic/#pkg-note-BUG

closes #5341

update pricing to include 1 million free API requests per month

Previously, if a user changed the query between
requests, the previous query would not be
canceled. This handles that edge-case.

Depending on context in the code, rename cacheKey
to exprID when it identifies a unique expression,
and rename cacheKey to requestID when it is
identifying a request.

Allow the datasource to decide how to handle a
canceled request.

Responsibility is now to pass the cacheKey through
to `datasourceRequest` in each datasources'
implementation of `query`.

Conflicts:
	public/app/plugins/datasource/influxdb/query_part.ts

feat(prometheus): restore old prometheus query editor, revert this commit in prometheus query editor v2 branch

Repeat Prometheus requests with the same query
will cancel preceding requests.

Repeat requests, if they already exist in the
in-flight request map, will cause the previous
request to cancel.

The implementation of the unique key is the
responsibility of individual datasources.

Enable the "limit" param in /api/search