+ occi: add the <srid> parameter, which when is set togheter with <geometry_field> allows to not query the metadata table at all (saving a huge amount of time when rendering lot of tiles!)
+ ability to import collections and multi-geometries correctly
+ added a parameter to control the usage of the connection pool
+ added more verbosity in debug mode, to report wrong enums
+ occi.input: added table_from_sql to allow specify SELECT statements in table parameter
+ occi.input: added use_spatial_index parameter (on by default)
+ occi.input: improved determination of query columns type