Allow for comparing datapoints from multiple datasources

Were now using Groovy scripts to combine multiple SQL Queries inside a Datasource, although its far from trivial to create a groovy script. You need to take time and learn groovy, including downloading and installing eclipse, and the Groovy plugins, and then learn the language. In fact, its extremely difficult if you are starting from scratch, and really requires a dedicated person with some development background to just get started. Frankly, its out of reach for the typical system administrator as a side project.