moved dashboard stuff into a feature folder, not sure about this, but need better structure and better way to organize dependencies

Allow for plugin testing.

Bring panel alert to front and move tooltip to top.

This makes the panel a lot easier to mouse over without odd visual effects.

With this change in place you can include plugin specs in `grunt test` by creating a `src/config.js` like that includes something like this:

```js
      plugins: {
        // list of plugin panels
        panels: [],
        // requirejs modules in plugins folder that should be loaded
        // for example custom datasources
        dependencies: ['grafana-plugins/atlasDatasource'],
        specs: ['grafana-plugins/specs/atlasDatasource-specs']
      }
```

Graph: Fix for y axis and scaled units (GiB etc) caused rounding, for example 400 GiB instead of 378 GiB, Fixes #1251

Panel: duplicate now always adds the duplicated panel on the same row instead of creating a new row, Closes #1185

Graphite: alt node suggestions will now not include wildcard or template variables if the node is empty, Closes #1230

fix #1204: add separate datasource parameter withCredentials

Add offsetToZero to gfunc.