improvement in mobility
Merge branch 'master' of github.com:pylayers/pylayers

Conflicts:
	doc/notebook/9-PRES/files/W1M1points.png
	doc/notebook/9-PRES/files/WHERE1Vis.png
	pylayers/util/CDF.py
Merge branch 'master' of github.com:pylayers/pylayers
Merge branch 'master' of github.com:pylayers/pylayers
typo fix