fips should print an error message when run outside the "expected" directory.

[floooh]

See this issue for details: #239

[floooh]

...it actually works as intended on macOS and Linux, since those run the fips python script directly. But on Windows, the fips.cmd wrapper is run, which looks like this:

@python fips %*

What this actually tries to run is the fips directory as a python script, thus the error.