Added method bool continuous () to interface.

Returns true, if the discrete functions that belong to this function space
are continuous.

Furthermore added methods to get polynom order of base functions.

[[Imported from SVN: r184]]

fem/discretefunctionspace.hh

@@ -57,6 +57,12 @@ namespace Dune {
       return asImp().getBaseFunctionSet( en );
     }
 
+    //! return true if we have global continuous discrete functions.
+    bool continuous () const
+    {
+      return asImp().continuous();
+    }
+
     //! Get maximal polynom order of functionspace.
     int polynomOrder () const
     {