Results 3 issues of corpglory-dev

Fixes #94 This PR fixes the problem that axes labels do not react to template variables changes. When you change a template variable, only metrics are re-rendered. Axes are re-rendered...

![image](https://user-images.githubusercontent.com/47055832/76432045-791df380-63c3-11ea-9618-2dac24a7b09a.png) Template variables can be used as axes labels. The problem is that labels are not updated when the variable is changed. Timerange change is necessary to see a change....

Chartwerk panel is supported since Grafana 6.6. Though it works somehow in earlier versions. We should display a warning when Grafana version is not supported

good first issue