An attempt to add the plot histogram function to GenericGeometry as a mixin class rather than part of Visualization
Added automatic label generation to Delaunay
Updates to the logger messages.
- Its sometimes difficult to know where error messages come from.
- We should think about use raise Exception or something that actually aborts the code and outputs a trace of the problem.
Many changes to the Network module:
- Fixed a bug in Template that was preventing generation (the number of pores was being miscounted)
- Added Sphere and Cylinder subclasses of Template.  These just make the required image and use the Template methods.
- Added a NullNet which if for basic testing purposes.  I has no pore or throat data at all.  The intention is to build a network from scratch if needed.
Small updates to the Network additions
- Sphere and Cylinder have been tested and viewed in Paraview
- A cylinder of length = Lc gives a circle!