There is no need for quotes in variables assignments since dash 0.5.11
or newer, cf [1].
The keyword 'local' is supported by dash, so let's use it consistently,
cf [2].
It seems that we want to quote filenames, so let's try to do it
consistently, even though at the moment spaces in filenames are not
supported anyway, due to the loops 'for f in $FILES_TO_DIVERT'.
[1]: https://unix.stackexchange.com/a/97569/105794
[2]: https://stackoverflow.com/a/18600920
6633eac355