Changed dimension type from long to int
added cell_handle and const_cell_handle, facet_tag and facet tag for domain and segment
added point() with only one argument (no domain and segment required)
added make_cell and make_cell_with_id, fixed make_hexahedron
implemented concepts: accessor, field
adapted to accessor/field
Adapted to accessor/field concept
Fixed typedefs, adapted to accessor/field concept
Bugfixes with accessor (wrong accessors used)
removed static, not needed
adapted to accessor/field concepts
Adapted to new ViennaGrid, work in progress
adapted to accessor/field concept, fixed ordering for vertex and cell data
Fixed file
adapted to accessor/field concept
renamed accessor registration function
renamed accessor registration functions
re-enabled test (except serialization)
Adapted to current version of ViennaGrid