* palce xfail on rename_after ... test
* Adding a commmnet to force commit
* alternate approach in testOBufInterface
* reverting _analyze.py
reaming the simulation objects
* typos
* final commit to 'finish' PR submission
* And of course I forgot the 'xfail'
* cleaning up wild import in test_tristate.py to provoke another Travis/CI run
* There is something wrong with the 'xfail' so I just commented out the offender
* uncommented the second test in test_tristate.py
* Changed the object names in the testbench, hoping to narrow down where it fails
* Changing more object names
* myhdl.c: added #ifdef _WIN32 clause to get the pipes working in WIndows 10, properly (auto-)formatted the source
util.py: changed the myhdl.vpi path to defaukt to iverilog's known system path
test_tristate.py: the TestTristate class re-used the tristate_obuf.o for the test with the interface; which put iverilog on the wrong foot ...
* util.py: make a distinction between Windows and Linux systems where to get myhdl.vpi
