(Pes) Remove redundant parameters in V*, VP and Cl

Keep VerbForm at VP level, and rename VPHTense to use Tense and 
Anteriority instead of custom names that are then mapped to Tense and 
Anteriority in Use*Cl functions.

WIP: Remove Aux type and use beVerb instead of beAux. There were a lot 
of comments along the lines "check the right form"; will do that with a 
native speaker.

src/persian/PhrasePes.gf

@@ -17,7 +17,7 @@ concrete PhrasePes of Phrase = CatPes ** open Prelude, ResPes in {
     UttNP np = {s = np2str np} ;
   	UttCN cn = {s = cn2str cn};
     UttAP ap = {s = ap.s ! Bare} ;
-    UttVP vp = {s = showVPH VPInf defaultAgr vp} ;
+    UttVP vp = {s = showVPH Inf defaultAgr vp} ;
 
     PConjConj conj = {s = conj.s2} ;