OBS_GetAvailableGeometries now has number of geometries parameter

We've add a new parameter, number of geometries, that would be used
by DO to compute the geometry that better fit with the input provided

client/renderer/interface.yaml

@@ -427,6 +427,7 @@
     - { name: numer_id, type: text, default: 'NULL' }
     - { name: denom_id, type: text, default: 'NULL' }
     - { name: timespan, type: text, default: 'NULL'}
+    - { name: number_geometries, type: integer, default: 'NULL'}
 
 - name: obs_getavailabletimespans
   return_type: SETOF cdb_dataservices_client.obs_meta_timespan