(Por) change copula type from bool to sum param

Portuguese actually has several verbs that can act as copulas,
although the main ones are ser and estar. this allows other types of
copulas to be added.

src/portuguese/DiffPor.gf

@@ -72,11 +72,20 @@ instance DiffPor of DiffRomance - [chooseTA,partAgr,vpAgrSubj,vpAgrClits] = open
       in
       neg.p1 ++ verb ++ bindIf refl.p2 ++ refl.p1 ++ bindIf clpr.p3 ++ clpr.p1 ++ compl ;
 
+  param
+    Copula = SerCop | EstarCop | FicarCop ;
+
   oper
-    CopulaType = Bool ;
-    selectCopula = \isEstar -> case isEstar of {True => estar_V ; False => copula} ;
-    serCopula = False ;
-    estarCopula = True ;
+    CopulaType = Copula ;
+    selectCopula coptyp = case coptyp of {
+      SerCop => copula ;
+      EstarCop => estar_V ;
+      FicarCop => ficar_V
+      } ;
+
+    serCopula = SerCop ;
+    estarCopula = EstarCop ;
+    ficarCopula = FicarCop ;
 
   oper
     -- the other Cases are defined in ResRomance

src/portuguese/ParadigmsPor.gf

@@ -256,7 +256,7 @@ oper
     mkA : (blanco : A) -> (hueso : Str) -> A -- noninflecting component after the adjective
       = mkNonInflectA ;
 
-    mkA : A -> CopulaType -> A -- force copula type, e.g. "João está doente", "João é doente"
+    mkA : A -> CopulaType -> A -- force copula type, e.g. "João está doente", "João é doente". Choose among ``serCopula``, ``estarCopula``, and ``ficarCopula``
       = adjCopula ;
 
     } ;