Fixed a column name of preferencias_tuberias in jtable of 'preferencias'
Fixes when the 'altermative code' static field is reset'
Uses NumberFormat to format the result of 'caudal_total' in 'alternativas' layer
Adds fk constraint in alt_valvulas

BTW a pg_tap test if the delete cascade constraints are working
simple cases is added
Remove form check on not editable fields