Bugfix when compiling with mpi and some other things ...

AMDiS/src/AMDiS_fwd.h

AMDiS/src/CoarseningManager.h

AMDiS/src/DOFMatrix.cc

AMDiS/src/DOFMatrix.h

AMDiS/src/DOFVector.h

AMDiS/src/DOFVector.hh

AMDiS/src/DirectSolverInterface.h

AMDiS/src/ElInfo.h

AMDiS/src/ElInfo1d.cc

AMDiS/src/ElInfo1d.h

AMDiS/src/ElInfoStack.h

AMDiS/src/GaussElimination.h

AMDiS/src/Global.h

AMDiS/src/GlobalDOFNumbering.h

AMDiS/src/GlobalElementNumbering.h

AMDiS/src/LeafData.cc

AMDiS/src/Parametric.h

AMDiS/src/ProblemScal.cc

AMDiS/src/ProblemScal.h

AMDiS/src/Recovery.cc