moved examples to correct place
tweaked command line interface
added mli for global compiler
streamlined code and moved auxilliary functions to more appropriate places
added vswitch and vport fields
first virtual compiler hack
completed raw virtual compiler framework; no command line interface yet
added Arjun's idea of virtual ingress specifications
virtual compiler command line interface
tuned command line interface and started example;
TODO: (i) finish example
(ii) adapt local compiler so it can handle vswitch and vport
virtual compiler example