Sensless feedback loop

`JimfsFileSystemProvider#getFileSystem(URI)` and `JimfsFileSystemProvider#getPath(URI)` just throw exceptions telling you to use `FileSystems.getFileSystem(URI)` and `Paths.get(URI)` respectively, but those recommended methods just fall back on calling these ones that throw unconditional exceptions.

Expectation:

You call `Paths.get(URI)` where the URI has a `jimfs` scheme and you get a `Path` object.

Reality:

You get an exception saying `This method should not be called directly; use Paths.get(URI) instead.`