ajout logo entete

Correction de bug (Clément D.). RAS

To avoid isonomy because the files are indexed by the TeX distribution

It works because Refresh File Name Database also localizes the resources

Margins too wide when no option (oneside or twoside) given to \documentclass

In notitlpage option with single logo

Added archiving script

The logos are available for everyone on École polytechnique's site.

Made by Antoine Pelletier

*Code for titlepage and notitlepage options no more delayed with \AtBeginDocument, it is declared in the right place with an auxiliary command
*Added layout for a second logo with the notitlepageoption, layout made by DIRCOM