Use new SQL to speed up task browse pages.
Use new SQL to speed up task browse pages.

Scifabric/pybossa,OpenNewsLabs/pybossa,Scifabric/pybossa,geotagx/pybossa,jean/pybossa,PyBossa/pybossa,OpenNewsLabs/pybossa,geotagx/pybossa,PyBossa/pybossa,jean/pybossa