Python bindings: Release GIL before blocking in poll(), re-aquire during callbacks.
Python bindings: Release GIL before blocking in poll(), re-aquire during callbacks.

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