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TransferFunction _common_den rewrite - issue #194 (#206)

* replaced the _common_den function internals. Passes tests
* make xferfcn.py python2 compatible again
* working tf -> ss transformation now, also solved #111
* disabled MIMO test when no slycot
* do not cancel pole/zero pairs before calculating pole() in xferfcn.py
- for the above reason, do conversion on minreal'd xferfcn in statesp.py
- add a test for not canceling pole/zero pairs when calculating pole()
- add import of matlab in discrete_test.py
* change testModred; that one did state removal on a system of which the selection of states was automatic

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