Hide ELLE extesions
An alternative is only valid if
'demanda' > 0
and 'caudal_fuentes' > 0
and demanda <= caudal_fuentes
Set the correct fieldnames for 'alt_fuente' layer
Fix bug on the queries of 'comunidades' and 'fuentes' that intersect
with an alternative

Both must be filtered by the code of the alternative. And in 'fuentes'
we must get also those in the 'alt_fuentes' layer
Recalculate the population of the alternative in the trigger
Set the code in OpenAlternativeExtension
Zoom to layer when using some of the OpenXXExtension
Changed domain name from 'tipo_abastecimiento' to 'tipo_distribucion'

This name is more accurate and coherent with the terminology used in
the alternatives.
Upload ddl for changes in the model
Update triggers due to the changes in the model
Minor changes in the java code due to the changes in the model
Update form for 'bombeos' with the model changes
Update form for 'fuentes' with the model changes
Update form for 'tuberias' with the model changes
Fields that must be visible in the jtables where 'conexiones',
'depositos' and 'embalses' appears
Update form for 'alternativas' with the model changes
Upload data for 'preferencias_bombas' and 'preferencias_tuberias'