and no longer always cd to dist-extras

and explicitly check for its own dependencies

Partially fix using the opensuse toolchain from cygwin

Only create junction to includes if it does not exist yet

testers needed!

Rewrite cross-compiling instructions to use docker and opensuse 13.1

and fix markdown lists

Vagrant instead of Docker

adjust msys2 setup steps

Test with msys2's python2

Remove path recommendation, not really needed any more

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separate installers are annoying, but MSYS2 python does not play well with virtualenv

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