(Hun) Add SgAll to the forms

src/hungarian/ParamHun.gf

@@ -72,6 +72,7 @@ param
   NumCaseStem =
     SgNom | SgAccStem | SgSup -- These may use 2-3 different stems
   | PlAcc  -- May have irregular vowel in suffix
+  | SgAll  -- May have irregular vowel in suffix
   | SgInsStem -- Instrumental and translative: -v after vowels
   | SgStem  -- Rest of the cases in Sg
   | PlStem  -- Rest of the cases in Pl
@@ -150,6 +151,7 @@ oper
     SgNom => "SgNom" ;
     SgAccStem => "SgAccStem" ;
     SgSup => "SgSup" ;
+    SgAll => "SgAll" ;
     PlAcc => "PlAcc" ;
     SgInsStem => "SgInsStem" ;
     SgStem => "SgStem" ;