User Interface: Move RRA's Link

[goldburtd]

This request may be so basic no body bothered to suggest it.

Currently to modify/create RRA templates, you must navigate to Data Sources on the left menu.

Data Sources
--- RRAs

I understand that makes sense in the rrdtool context, where a datasource stores its data in multiple RRA's, but for a novice cacti user this can be confusing.
In cacti, users see datasources as a link between a data template and a host. RRA's are specified when creating data templates.

I propose to change the navigation menu so that RRA is under Data Template.

Data Templates
--- RRAs

Same thing for Graph Management. Should be under Graph Templates

Graph Management
--- CDEFs
--- Colors
--- GPRINT Presets

[TheWitness]

Good point.