Restructuring of Matrix and Vector and linear-algebra backends

See merge request !107

Added init-finalize also for vectors.
Require gather/scatter operations instead of direct vector/matrix access.
Rewritten the interpolation.
Added ParallelIndexSet and DOFMapping to be used also in other backends.

derive some method from the super class in MacroGridFactory

See merge request !106

add NodeIndices.hpp to CMakeLists

See merge request !105

make capabilities a compile-time test whether backup-restore functionality can be used

See merge request !64

add AllTrueBitSetVector.hpp to CMakeLists

See merge request !104

Add range over node indices

See merge request !102

Added extended AllTrueBitSetVector class

See merge request !100

Add attach function with callback to GridTransfer

See merge request !97

Added missing install entries to CMakeLists

See merge request !103

Move transformTreePath helper function to HierarchicNodeToRangeMap

See merge request !101

Return stored MPIHelper from Environment

See merge request !98

removed unused variable from Marker

See merge request !96

default initialize MPI_Requests

See merge request !95

Added outer product for FieldVector

See merge request !93

Added flat matrix and vector used for ElementMatrix and ElementVector

See merge request !94

added code from the mpi14 library for parallel mpi communication with a nice wrapper interface

See merge request !83

update UniqueBorderPartition to support UGGrid

See merge request !87