Change cgp_calc return values

[almartin82]

Right now it returns both targets and results in a named list. I output should be controlled in a parameter

[almartin82]

I'm not sure this is a good idea anymore. It would require a major refactor on all the calls to cgp_calc. If we want to make the interface to cgp_calc more predictable and pipeable (which is a good goal), let's simply write specific wrappers around cgp calc that call the function as-is and extract the relevant object before returning it.