topics: use stack.stack() instead of stack.stackdata()
stack.stackdata() also calls stack.stack() internally. Moreover if we just want
to calculate changesetcount, troubled count, it will be cheap to calculate using
stack.stack rather than stackdata().
# name space package to host third party extensions
from __future__ import absolute_import
import pkgutil
__path__ = pkgutil.extend_path(__path__, __name__)