Merge pull request #143 from buguen/master

Adding plot3d to FUDsignal
fix in geometric localization
RSS observables can be merged or not (default) in cla.merge2()
RSS observables can be used (default) or not in cla.valid_v()
Merge pull request #145 from niamiot/master

improvements in geometric positioning
new feature : gis/layout/Layout change multi subsegment chgmss
Merge branch 'master' of https://github.com/pylayers/pylayers