Luciano_Carcagno:
Is there any way to get a summary of the resources used by each library and core functions?
No, I don't believe the library authors provide such a thing. And indeed some libraries can clash, particularly if they use timers, pin change interrupts, or indeed, any interrupts. Or for that matter, any pins at all.
Ditto for information on shields and pins.
You are in luck there, to an extent. Some sites do summarize shields and pins.
Example: http://www.shieldlist.org/