Add editor hints, fix includes and improve documentation.

[[Imported from SVN: r12657]]

dune/fufem/assemblers/localassemblers/geononlinlinearizedstvenantassembler.hh

-#ifndef GEOMETRICALLY_NONLINEAR_ST_VENANT_KIRCHHOFF_ASSEMBLER_HH
-#define GEOMETRICALLY_NONLINEAR_ST_VENANT_KIRCHHOFF_ASSEMBLER_HH
+// -*- tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+// vi: set ts=8 sw=4 et sts=4:
+#ifndef DUNE_FUFEM_LOCAL_ASSEMBLERS_GEOMETRICALLY_EXACT_ST_VENANT_KIRCHHOFF_HESSIAN_ASSEMBLER_HH
+#define DUNE_FUFEM_LOCAL_ASSEMBLERS_GEOMETRICALLY_EXACT_ST_VENANT_KIRCHHOFF_HESSIAN_ASSEMBLER_HH
 
 
 #include <dune/common/fvector.hh>
@@ -7,14 +9,20 @@
 
 #include <dune/istl/matrix.hh>
 
-#include "dune/fufem/quadraturerules/quadraturerulecache.hh"
-
-#include "dune/fufem/assemblers/localoperatorassembler.hh"
-#include "dune/fufem/staticmatrixtools.hh"
+#include <dune/fufem/quadraturerules/quadraturerulecache.hh>
+#include <dune/fufem/assemblers/localoperatorassembler.hh>
+#include <dune/fufem/staticmatrixtools.hh>
 #include <dune/fufem/symmetrictensor.hh>
 #include <dune/fufem/functions/virtualgridfunction.hh>
 
-/** \brief Assemble the second derivative of a geometrically exact St.-Venant-Kirchhoff material.
+/** \brief Assemble the second derivative of the geometrically exact St.-Venant-Kirchhoff material
+ *
+ *  \f[
+ *      J(u) = \int_{\Omega} E(u):C:E(u) dx
+ *  \f]
+ *
+ *  which results in the bilinearform
+ *
  *    \f[
  *      a_u(v,w) = \int_{\Omega} \sigma(u)E''_u(v,w) + (C:E'_u(v)):E'_u(w) dx
  *    \f]