Replace Category with Type in the PGF API. Added readLanguage and showLanguage.

src/GF/Compile/GFCCtoJS.hs

@@ -26,7 +26,7 @@ pgf2js pgf =
    n  = prCId $ absname pgf
    as = abstract pgf
    cs = Map.assocs (concretes pgf)
-   start = M.lookStartCat pgf
+   start = prCId $ M.lookStartCat pgf
    grammar = new "GFGrammar" [js_abstract, js_concrete]
    js_abstract = abstract2js start as
    js_concrete = JS.EObj $ map (concrete2js start n) cs