Create a SmartPtr<T> class

[Peter]

daughter of ticket:287

Class holds a pointer T*

Also it holds a reference_counter in a u_int*. If u_int* is NULL class is not owner of the T*. If u_int* is not NULL the pointer is used to count how many owner T* has. Increment and decrement in assignment and copying - see DataLookup2D for this behavior.

Class SmartPtr? can be created either from a pointer, in which case reference counter is set to one. SmartPtr? can also be created from another Smartptr i.e. a copy constructor. For time being we do not allow copying from one type to another.

This class belongs in utility.

[Peter]

In case of constructor from a dummie pointer I think we should allow user to set owner=false, i.e. ref_count u_int* is NULL.

[Peter]

in [1044]