Track backup targets explicitly specified by the user and prevent
excluding them. This for example ensures that `restic backup
--exclude-if-present .git /home/user/data` backs up the `data` folder
even if there is a `.git` folder in `/home/user`.
Note that this does not suffice for commands like `restic backup --exclude data /home/user/data`
as the exclude pattern will still match every single file within `data`.
internal/archiver.readdir and internal/fs.ReadDir were unused.
internal/fs.ReadDirNames and internal/archiver.readdirnames were doing
nearly the same thing, except one sorted its output and opened with
fs.O_NOFOLLOW. Both were only used in internal/archiver.
Michael Eischer
Alexander Neumann
greatroar
George Armhold