Restored testconvergent.c to using multiple devices for map sources.
Restored testconvergent.c to using multiple devices for map sources.

libmapper/libmapper,malloch/libmapper,malloch/libmapper,malloch/libmapper,libmapper/libmapper,malloch/libmapper,radarsat1/libmapper,malloch/libmapper,libmapper/libmapper,radarsat1/libmapper,libmapper/libmapper,radarsat1/libmapper,libmapper/libmapper,radarsat1/libmapper,malloch/libmapper,radarsat1/libmapper,libmapper/libmapper