Files within tagged directories do inherit the tags for all relevant features

[novoid]

A file like $HOME/subdir1 -- foo/subdir2/a file.txt does inherit the tag "foo" from its absolute path.

#13 has to be done beforehand.

FIXXME: think about all implications of this feature and how to handle it. E.g., there will be untagged files in tagtrees and you don't have a clue why this file is there and you can't remove its filetag.

Note 2019-09-21: The TreeTags concept might give some potential solutions for combined tags within directory names and file names.

[novoid]

Please do read #13 as this is somewhat of a sub-task of it.