Interface REnvironmentInformation

First of all, yes, R stores its environments differently, potentially even with a different differentiation between the baseenv, the emptyenvand other default environments. Yet, during dataflow we want sometimes to know more (static reference information) and sometimes know less (to be honest we do not want that, but statically determining all attached environments is theoretically impossible --- consider attachments by user input). One example would be maps holding a potential list of all definitions of a variable, if we do not know the execution path (like with if(x) A else B).