Use explicit model name in medulla GEXF file, change default GPU for lamina_demo.py.
Replace larry-based routing class with a pandas-based version, remove larry install dependency.
Make LPU.py docstrings more clear and correct several mistakes in the attrib descriptions.
Fix visualizer to enable specification of actual neuron IDs in LPU GEXF file, update intro demo visualizer script accordingly.
Fixed a bug in LPU.py.
Merge remote-tracking branch 'original/master'