Try to guess and display max upload size

[vincent-peugnet]

I did it on Wcms, and I found this quite useful.

In my case, I think I was reading PHP parameter and admin parameter and then then displaying the bottleneck value. Maybe it's very complicated to browse all the chain of settings on a server and display the bottleneck.

[n-peugnet]

I will add a parameter in the config file as the admin knows better than anyone what is the real upload limit on the server