Issues with Siegfried output - directories and None ID

[ross-spencer]

It looks like there are a couple of remaining issues using Siegfried data. Possibly restricted to Windows?

1. Number of folders is incorrect in the report below, there are many more than 1. We should know this. There is also a compound problem here where "unique directory names" = 0 is also wrong.

2. Identification type None is causing some confusion. It looks like it's part of the "unidentified files" count, but what's it actually saying?

Data: sf-data-windows.zip