added Environment for MPI initialization

This MR replaces the old AMDiS::init() - AMDiS::finalize() pattern with a RAII class Environment, to be instantiated at the begin of the main method, i.e.

int main(int argc, char** argv)
{
  Environment env(argc, argv);

  // get MPI rank and size from environment after instantiation:
  std::cout << Environment::mpiRank();
  std::cout << Environment::mpiSize(); 
}

the ``finalize'' is called automatically when env is destructed, i.e. at the end of main().

src/amdis/AMDiS.hpp

@@ -4,6 +4,8 @@
 # include "config.h"
 #endif
 
+#include <dune/common/deprecated.hh>
+
 #include <amdis/AdaptInfo.hpp>
 #include <amdis/Environment.hpp>
 #include <amdis/Initfile.hpp>
@@ -11,4 +13,30 @@
 #include <amdis/Output.hpp>
 #include <amdis/ProblemStat.hpp>
 
-namespace AMDiS {} // end namespace AMDiS
+namespace AMDiS
+{
+  /// Initialized the Environment for MPI.
+  /**
+   * NOTE: deprecated
+   * Use \ref Environment at the beginning of the main() instead:
+   *
+   *   int main(int argc, char** argv) {
+   *      Environment env(argc, argv);
+   *      // do somthing.
+   *   }
+   *
+   **/
+  inline void DUNE_DEPRECATED init(int& argc, char**& argv, std::string const& initFileName = "")
+  {
+    static Environment env(argc, argv, initFileName);
+  }
+
+  /// Closes the MPI environment
+  /**
+   * NOTE: deprecated
+   *
+   * The \ref Environment is closed automatically on destruction.
+   **/
+  inline void DUNE_DEPRECATED finalize() { /* no nothing */ }
+
+} // end namespace AMDiS