option to exclude parent/shell folders

[Herbert Feutl]

based on this conversation https://plus.google.com/+HerbertFeutl187/posts/DTNR9tr5Ej7

a easy way to exclude/hide parent foldery including their subfolders

#!

- sync
|- 2016
|--- 2016-01-01
|--- 2016-02-12
|--- 2016-04-09
|- 2017
|--- 2017-09-21
:
:
:

at the moment the parent folders are not displayed if empty

[Anthony Mandra]

close #352, parse all parents up to permission tree, match all children when hiding.

→ <<cset 1b28354447e4>>