cfg integration into trace set format #22

integrate config data (target, samplerate, conditions) because im an idiot who keeps saving things as "lol1.hdf", "lol2.hdf", "lllll.hdf" and can't remember what they were.

dataset "config_data" = ["cfgname:cfgval","cfgname2:cfgval"]
self.f.config_data
hasattr

touchpoints:
TraceManager.get_config("option_name")
TraceManager.set_config("option_name","value")
TraceManager.save()
FileManager.init()
preprocessor touchpoints?

should be entirely optional (i.e. no config data means we rely on old cmdline args)
config values should supersede cmdline (because cmdline can be wrong).