shadow3

Hi,

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:

http://forge.epn-campus.eu/attachments/2478/report-shadow-efields.pdf

The shadow git distribution is just updated.

Regards,

M