Extend the use of colon prefix for read/assignment OLD/NEW fields and 
assignment to variables
---------------------------------------------------------------------------------------------

                 Key: CORE-4434
                 URL: http://tracker.firebirdsql.org/browse/CORE-4434
             Project: Firebird Core
          Issue Type: Improvement
          Components: Engine
            Reporter: Adriano dos Santos Fernandes


As part of CORE-4403, it's possible to use the colon prefix to read cursor 
fields.

This ticket is to document the change for OLD/NEW fields and aissgnments to 
variables. This is now valid syntax:

create trigger t1 before insert on t1
as
  declare v integer;
begin
  :v = :old.n;
  :new.n = :v;
end

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