futurizing stage 2 geometry and cleaning

[rkwi]

No description provided.

[coveralls]

Coverage decreased (-0.01%) to 41.793% when pulling 5c2aea5 on rkwi:anuga_py3 into 9d4ca4d on stoiver:anuga_py3.

[rkwi]

Stage 2 will change all old style class declarations into new style class declarations. For instance in quad.py 'class cell' will be changed into 'class cell(object)'. In Python 3, any old style class declaration is considered as the later. Unfortunately, this causes issues when we try to use pickle.loads to read an instance of a new style class. Currently, I manually changed it back into 'class cell', but we have to solve this later, maybe by including the init arguments inside the stored byte object.