Reworked PoissonDriver1D to offer an automatic mode (iterating over many options), and to support spaceDim from 1-3.  Renamed accordingly.
Added getSideCount() to Cell.
Fixed an issue in OverlappingRowMatrix in which 1D cells would appear not to have neighbors.
Commented out write to file in PoissonDriverBarkerAdditiveSchwarz.
Removed extraneous comment.
Added support for computing 2-norm of serial dense matrices (represented as FieldContainers).
Added CellTests (to start, just a simple one checking neighbor relations for 1D cells).