Merge pull request #153 from buguen/master

Adding an argument in geomfile for disabling systematic centering
- bug correction for mobility in layout : agent can now cross airwalls
- exploit_simulnet class to trace trajectory of the agent and their LDP
  evolution for a saved simulnet simulation
- correction in Person.py : no need to contiguous numbering of room
Merge pull request #154 from niamiot/master

- bug correction for mobility in layout : agent can now cross airwalls
DOC-RayTracing2 notebook broken
removing conflicting notebook
All output clear in notebook