[Feature request] Update Graphite support to include functions introduced in the 1.0.0 release.

[bascarsija]

Master (88dd8af at the time of writing) does not support the selection/autocompletion any of the new Graphite functions introduced in the 1.0.0 release, as listed in the release notes.

Issue #2481, which predates the Graphite 1.0.0 release, requests that a specific function (i.e. fallbackSeries()) be added, but @torkelo responded that the function should only be added "when it is available in the latest stable release."

Now that 1.0.0 is available, fallbackSeries() and all of the other functions introduced in 1.0.0 should be added to the set of functions supported by the selection/autocompletion feature.

As an aside, note that #4622 separately requests the addition of a new feature to maintain version-specific function sets and allow users to specify the data source version.

[torkelo]

Some tips on how to implement

Add Graphite Version option to data source settings

Implement similar to ES version, https://github.com/grafana/grafana/blob/master/public/app/plugins/datasource/elasticsearch/partials/config.html#L26
https://github.com/grafana/grafana/blob/master/public/app/plugins/datasource/elasticsearch/config_ctrl.ts#L24
Add version property and filtering to function definitions
https://github.com/grafana/grafana/blob/master/public/app/plugins/datasource/graphite/gfunc.js#L36
https://github.com/grafana/grafana/blob/master/public/app/plugins/datasource/graphite/gfunc.js#L755

So that function menu / autocomplete only shows functions for your graphite version, add new function definitions for Graphite 1.0 functions