Incorrect class names used when calling base class methods

[gak]

When calling methods on objects that were defined in a superclass, the child class is used for the node's class_name rather than the class where the method was defined.

Example:
{{{
class A(object):
def init(self):
pass

class B(A):
def init(self):
A(self)
}}}
Will result in two nodes, both with class B rather than one of each. I've attached a patch to fix this

[gak]

Author: mage2k@gmail.com
Note that that diff was the result of this patch against a version of pycallgraph.py that had already been patched with my call sequencing edge labeling patch.

[gak]

Author: gak
There's nothing in the patch!