Pushed.

So far, the idea was to only circumvent the non-existing modules on Windows. The
script now runs on Windows, but porfolio functionality (and SIGXCPU) is not
supported.

https://bitbucket.org/SilvanS/fd-dev/branch/issue543

I think it would be great if our scripts in misc/test/ also worked, but some of
the steps there fail because Windows tries to run some of the indirectly called
scripts as a Windows application rather than as a python one. Maybe we can have
a look at these during the sprint.

I think this is not just a matter of easier testing; "fast-downward.py" is in
some sense "the planner". (I'm not sure our documentation is up to date with
this, but that's more of a documentation bug. ;-))

Silvan, I see you assigned this to yourself, but I'm happy to help on this
during the sprint. Just let me know.

For easier testing on Windows (also for the buildbot), fast-downward.py should
be compatibe with Windows. One problem we know of is "import resource".