#113 Generic Fields with customizable aliases (synonym).

[Marcelo Coicev]

Allow creation of "generic" fields, with as many
"alias" (or synonyms) as needed.

So , when putting a field in a form, one of the alias
caption could be selected to be used as "caption" in
the form.

The privileges for the users could be also associated
to the alias (instead of the generic field) in order to
allow a user to acces a field based on the role defined
by the alias.