Python bindings: fix int->float coercion for mapping range.
Python bindings: fix int->float coercion for mapping range.

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