Work on const / non-const in wolf base classes

In wolf we use shared pointers. So a class attribute is not changing if the object pointed changes. I don't know if there is a solution to handle this appropiately. At least, this implies changing two things:

• Making const some classes functions.
• Changing to XxxCPtr some arguments in other functions.
• const functions cannot change the content of the pointed objects. (I don't know how this should be implemented)