* docs: Fix typos and minor improvements
* feat: Log the backup stats summary to a CSV file
The log records the added, removed and snapshot size after each backup.
* feat: Add the snapshot ID to the stats log
* docs: Update README with the stats log info
* fix: Linter 1: Quote var
* fix: Linter 2: Shellcheck declare and assign separately
* feat: Turn the stats log into an opt-in
When backing up a desktop system it is handy to have regular and
immediate feedback about backups. This features a notification of backup
stats summary, including the added size to the repository, so you can
have a quick follow-up about what are you uploading to the repository.
This may be very useful if you upload by accident a big file or directory
which should be in your exclusions, so it warns you and gives the chance
to fix the exclusions and remove the undesired snapshot later.
Gerard Bosch