added Environment for MPI initialization

examples/boundary.cc

examples/cahn_hilliard.cc

examples/convection_diffusion.cc

examples/ellipt.cc

examples/heat.cc

examples/navier_stokes.cc

examples/neumann.cc

examples/periodic.cc

examples/stokes0.cc

examples/stokes1.cc

examples/stokes3.cc

examples/vecellipt.cc

src/amdis/AMDiS.cpp

src/amdis/AMDiS.hpp

src/amdis/AdaptInfo.cpp

src/amdis/AdaptInstationary.cpp

src/amdis/AdaptStationary.cpp

src/amdis/CMakeLists.txt

src/amdis/DataTransfer.inc.hpp

src/amdis/Environment.cpp