Fixed two minor mistakes in Abastecimientos form.
Relations moved to fonsagua schema.

Changed all related code.
Added a NavTableForm subforms OR filter.

It allows us to combine multiple values.
Added a jtable contextual menu w/o del and new.

It has only the update option.
Created a handler for alphanum through a N:N rel.

We can retrieve alphanumeric tables related to a
table which is related to the current one through
a N:N relationship.
Added the missing embedded handlers.

This includes valoracion de sistema, implicacion de
la comunidad, adescos and datos consumo.