added dimension == 2 to if-clause for recreateboundaryids as it basically reorientates the boundaroies

for some reason you cannot use 999 as bounadryid for hte fake boundaries, because then the linkage breaks

structured the 2d test more like the 3d test with a loadbalance after construction

error in communicator - in this version it always defaulted to the default
non parallel CollectiveCommunicator. CreateBoundaries is also called for
local geometry creation for which the non parallel default is correct. This
should be solved by getting the right type from the GridType.

odd macrovertex ids are now the real vertices
added a GlobalIdType to gridfactory to have a better distinction between the global id and the index inside the vertexvector

version the expression was put into a sizeof which avoids the not used
warning but does require that the expression is well defined. In many
places in alu that is not the case because the not used warning is removed
at the place it occurs.

Before the program aborts after an assert fails, it is now
possible to attach a debugger (if the correct defines are set).

Parallel grid creation through dgf not implemented for 2d

Merge branch 'parallel2d' of https://users.dune-project.org/repositories/projects/dune-alugrid into parallel2d