update cone method
Merge branch 'master' of github.com:pylayers/pylayers
bug fix in cone
- change default file (defstr3 => defstr)
- bug fix in g2npy (crash if no airwall)
bug fix in agent (incorrect epwr/sens)
bug fix (incorrect epwr/sens)
add a netwoork boolean to initilaize network simulation (or not)
- Enable possiblity to run a mechanical simultion without network
  simulation
cahnge default simulnet.ini with network True/False option
add pandas.Dataframe save format to Person
Merge branch 'master' of github.com:pylayers/pylayers