Make VariantReporting::Command::CreateReport use Genome::Process

This breaks the Trio wrapper, which needs some more refactoring before it can have Genome::Process integration.
It is a coincident actually.  For other processes it will not be the case, I'm thinking of the Trio wrapper right now.  The name 'inputs' is perhaps misleading and maybe another name could be conjured that connotes metadata more.  The purpose of the process inputs is just to allow for tracking non file-based metadata about how/why a process was run that could be sub-class specific without requiring a new db table per subclass.