Make dune-disc optional

[[Imported from SVN: r3021]]

ag-common/functiontools/leafp1functiontransfer.hh

 #ifndef LEAFP1FUNCTIONTRANSFER_HH
 #define LEAFP1FUNCTIONTRANSFER_HH
 
+#if HAVE_DUNE_DISC
+
 #include <vector>
 
 #include <dune/common/bitsetvector.hh>
@@ -123,5 +125,9 @@ class LeafP1FunctionTransfer
 
 };
 
+#else 
+    #warning leafp1functiontransfer.hh was included but dune-disc is not present !
+#endif // end of #if HAVE_DUNE_DISC
+
 #endif
 

ag-common/neumannassembler.hh

 #ifndef NEUMANN_ASSEMBLER_HH
 #define NEUMANN_ASSEMBLER_HH
 
+#if HAVE_DUNE_DISC
+
 /** \file
     \brief Contains a method which assembles the right hand side term for Neumann boundary data.
 */
@@ -96,4 +98,8 @@ void assembleAndAddNeumannTerm(const BoundaryPatchBase<GridView>& neumannBoundar
     
 }
 
+#else 
+    #warning neumannassembler.hh was included but dune-disc is not present !
+#endif // end of #if HAVE_DUNE_DISC
+
 #endif

ag-common/surfmassmatrix.hh

 #ifndef SURFACE_MASSMATRIX_HH
 #define SURFACE_MASSMATRIX_HH
 
+#if HAVE_DUNE_DISC
+
 /** \file
     \brief Contains a method which assembles the FE mass matrix of a boundary patch of a grid.
 */
@@ -133,4 +135,8 @@ void assembleSurfaceMassMatrix(const BoundaryPatchBase<GridView>& boundary,
 
 }
 
+#else 
+    #warning surfmassmatrix.hh was included but dune-disc is not present !
+#endif // end of #if HAVE_DUNE_DISC
+
 #endif

dune.module

 Module: ag-common
-Depends: dune-common dune-grid dune-istl dune-disc dune-localfunctions
+Depends: dune-common dune-grid dune-istl dune-localfunctions
+Suggests: dune-disc