which do not vary, and only match zero or one file.

more sense, and to make it easier to un-ambiguouosly identify the location
of a Match in a filetree hierarchy

Also made small fixes to trees that contained invalid characters

default to returning a flat list of matches. subtree-related fixes to scan
function

operators to Match class so it can be ordered. Protect Match attributes via
@property

mutate canonical version

for which an optional variable is not present

actually exist on disk (and corrsepond to files).

Includes now a tutorial on the FileTree format

It's called kurt rather than MK