the unix-permissions of new files/folders can now be changed
* global-option --chmod-f, volflag chmod_f for files
* global-option --chmod-d, volflag chmod_d for directories
the expected value is a standard three-digit octal value
(User/Group/Other) such as 755, 750, 644, 640, etc
when moving/deleting a file, all symlinked dupes are verified to ensure
this action does not break any symlinks, however it did this by checking
the realpath of each link. This was not good enough, since the deleted
file may be a part of a series of nested symlinks
this situation occurs because the deduper tries to keep relative
symlinks as close as possible, only traversing into parent/sibling
folders as required, which can lead to several levels of nested links