Merge branch 'feature/observer' into 'master'

examples/periodic.cc

src/amdis/AdaptiveGrid.hpp

src/amdis/BiLinearForm.hpp

src/amdis/CMakeLists.txt

src/amdis/DOFVector.hpp

src/amdis/DOFVectorInterface.hpp

src/amdis/DataTransfer.hpp

src/amdis/DataTransfer.inc.hpp

src/amdis/GridTransfer.hpp

src/amdis/GridTransferManager.hpp

src/amdis/LinearForm.hpp

src/amdis/MeshCreator.hpp

src/amdis/Observer.hpp

src/amdis/ProblemStat.hpp

src/amdis/ProblemStat.inc.hpp

src/amdis/ProblemStatTraits.hpp

src/amdis/common/CMakeLists.txt

src/amdis/common/SharedPtr.hpp

src/amdis/functions/CMakeLists.txt

src/amdis/functions/ParallelGlobalBasis.hpp