flowstats: include all actions in flowStats
flowstats: implement translation btwn 0x01 and SDN
flowstats: reorg mli file for readability
flowstats: combine types for indvidual/aggregate stats request

Eliminate code duplication in the representation, parsing, and
marshalling of individual and aggregate stats requests. Both requests
have the same fields, and the fields behave in the same way
Merge pull request #177 from frenetic-lang/flowstats

implement flowstats translation between 0x01 and SDN