Analysis of ch13: braking curves

Find on the Github:

- external inputs needed for the ch13 Scade model
- eFFBD html
- tracability between ch13 requirements and eFFBD html
- braking curves ch13 analysis document, intended to ADD document

This is only the fist step, therefore this is not finished
Please have look and tell us if you need some others types of information or some others figures

Signed-off-by: vgontier <veronique.gontier@all4tec.net>