Fixed bugs in instance id_map reference counting.
Fixed bugs in instance id_map reference counting.

davidhernon/libmapper-admin2,libmapper/libmapper,libmapper/libmapper,davidhernon/libmapper,malloch/libmapper,radarsat1/libmapper,davidhernon/libmapper,johnty/libmapper,malloch/libmapper,libmapper/libmapper,johnty/libmapper,radarsat1/libmapper,davidhernon/libmapper-admin2,davidhernon/libmapper-admin2,davidhernon/libmapper,libmapper/libmapper,malloch/libmapper,radarsat1/libmapper,johnty/libmapper,johnty/libmapper,malloch/libmapper,davidhernon/libmapper,libmapper/libmapper,radarsat1/libmapper,davidhernon/libmapper-admin2,radarsat1/libmapper,malloch/libmapper,libmapper/libmapper,davidhernon/libmapper,malloch/libmapper,johnty/libmapper,davidhernon/libmapper-admin2