Work on pdd and general code refactoring.

AMDiS/src/CoarseningManager.cc

AMDiS/src/DOFMatrix.cc

AMDiS/src/DOFMatrix.h

AMDiS/src/FileWriter.h

AMDiS/src/FirstOrderAssembler.h

AMDiS/src/FixVec.h

AMDiS/src/FixVecConvert.h

AMDiS/src/Flag.h

AMDiS/src/GNUPlotWriter.h

AMDiS/src/Global.h

AMDiS/src/GridWriter.h

AMDiS/src/Lagrange.h

AMDiS/src/LeafData.h

AMDiS/src/Line.h

AMDiS/src/ParallelDomainProblem.cc

AMDiS/src/ParallelDomainProblem.h

AMDiS/src/ProblemScal.cc

AMDiS/src/VtkWriter.hh