Fix serialize with multiple disks on windows

[urbanmatthias]

Fixes #1170

Proposed Changes

I replaced the path variable in the shutil.move call with location.
The former is the output of an urlencode call, which strips the drive letter on windows machines.
If the user has multiple drives, shutil.move will fail if the drive letter is not there.

[coveralls]

Coverage increased (+0.02%) to 75.694% when pulling 81d0f99 on urbanmatthias:patch-1 into e56df6e on RDFLib:master.

[coveralls]

Coverage decreased (-0.006%) to 75.667% when pulling 1fd1fb5 on urbanmatthias:patch-1 into e56df6e on RDFLib:master.

[ashleysommer]

Hi @urbanmatthias
I don't think this fix is quite complete, because it will now fail for UNC file locations, which used to work, like:
file:///tmp/outfile.ttl
In that kind of string, scheme is "file" and path is /tmp/outfile.ttl so path would be the correct variable to use.

Also, just a note, this works with Windows paths too:
file://c:\\tmp\\outfile.ttl
In this example, scheme is "file" and path is c:\\tmp\\outfile.ttl so again path is the correct variable to use.

A good middleground for this fix might be to test if scheme == "file" then use path otherwise, use location.

[urbanmatthias]

Yes you are right, thanks. I applied your suggested changes.

[ashleysommer]

Need review from one more Maintainer before we can merge.

[nicholascar]

Looks OK to me. I folowed back through graph.py to check all the URL parsing etc. and I think this will work fine.

[ashleysommer]

@nicholascar
As far as I can tell, this is only used in the graph.serialize() method and only when you've set a "destination" location. So unlikely to affect anything else in graph.py or URL parsing.
I'll merge.