add sensitivity to network
Merge branch 'master' into devel
add visibility attribute on network edges
Merge remote-tracking branch 'bernard/master'
nothing
nothing
Merge branch 'master' into devel
Modification in test_tud.py
autopep8 algebraic.py
First step to all numpy array tud evaluation
- Interractions class added which gathers al IntB/IntL/IntR/...
- Interactions and IntB/IntL/... inherits from Inter
- eval for IntB and IntL : OK
- GrRayTud load modified in order to accept the new Interractions

TODO :
- get the correct material into interraction and transform it into a
Slab instance
- get the angles of incidences for each materials used in the raytracing
in order to evaluate the slab
- interraction T / R and D
modification in rays.py
adding new test-file in antprop
fix bugs in buildGi of layout
work on converting signature into rays
ttempt to convert Ctilde to numpy array
- change load from GrRayTud
- add eval to GrRayRud
- Add Interractions class
- Add Inter meta class
- Change IntL/R/T/D/B classes
- small change into slab in order to choose to compute T or R
- add test_tud2.py to test theses changes
add a new version of signature class
some changes to be ignored
moving function signature from layout.py to signature.py and ranaming it get_sigarr
Merge branch 'devel' of https://github.com/niamiot/pylayers into niamiot-devel

Conflicts:
	pylayers/antprop/rays.py
	pylayers/antprop/tests/test_tud.py
adding sig2ray function to signature.py to compute ray from signature
nothing