Fix symlink handling and update to version 0.0.6.

There was kind of a big bug in previous versions: symlinks were
followed and they weren't supposed to be. This came down to a few
"stat" calls that should have been "lstat" calls. Those changes have
been made, and there's now a test for the correct behavior.

Unrelated: I capitalized the 'n' in the "No such file..." error.