Inspect module fails to find the correct starting line
number of a class. ::

  import inspect

  def a_func():
      class AClass(object):
          pass

  class AClass(object):
      pass

  print inspect.findsource(AClass)[1]
  # the result should have been 7, but it is 4

After reading `inspect` module I realized that for
classes it does a
simple RE search to find their definition location. 
Apart from that I
think python does not seem to fully support classes
with the same name
in one module (nested classes that are defined in other
functions or
classes).  That is a `ClassType` only holds its module
and its name
and that is hardly enough for runtime analysis of objects.

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Added a better find heuristics in rev.  52299, 52300 (2.5).
(More can't be done)