U/fjammes/dm 750

Hi Serge, 

Code is finished, but I still need to write documentation. (I may also had colored log if I've enough time.)
In order to test, you can use and update test/test-install-process.sh.

Thanks,

Fabrice
I would prefer if you used 0740 for any file with a .sh extension. The way you've implemented this you have to remember to check that this function does the right thing if you ever add scripts.