bug in shadow concerning electric fields
Just to let you know that I have fixed (I hope) the bug discovered by David which provoked an intensity
reduction in a lens after a crystal with mirror orientation angle 90 deg. This reduction of intensity was only
due to a bad management of the electric fields and should not happen as the lens was non absorbing.
I profited for documenting the how SHADOW manipulates the electric fields and I wrote this document:
The shadow git distribution is just updated.