Change on classical graphs

[thierry.chich]

I have done a new memory graph template. I believe it can be more comprehensive than the official one.

Hope this can help someone.

Furthermore, I have change the official load average graph. I believe it is a pretty bad template. I can't understand why we add the load average for 1 min to the load average for 5 min and to the load average for 15 min. It doesn't give a good indication of the real load average. I

I don't give the template I use because it is very simple to do, but I believe that the official template should be changed.

Ciao
Thierry