small errors in Arh3Reader/ rh3Writer corrected and ProblemStat::initialize modified to allow bahavior as in previous versions, for expressions::functors a degree mapper was added and the BlockMapper now is initialized with the correct number of components

Error in MeshDistributer corrected due to the use of non-initialized dofComm that is replaced by dofComms

extensions extended by unit-vector/-matrix; FixVec,Vector and Matrix corrected and extended; lots of other changes

merge from linearAlg-branch. my parallelization needed a slightly more general linear solver interface and uses the pvd-naming scheme from the petsc-parallelization

  overwritten
Others: Add each DOFVector by construction to the list of interchange vectors
and remove them by destruction
If you dont want to exchange the vector, set the boolean synch to false

check the overall number of macro elements with the one in parallel arh2 files after restarting program

Added Test_Exit for readMetaFromArh, fixed some (self included) conflicts for serial/parallel AMDiS (sorry)