execute prune one more time

to ensure garbage is collected. It takes small fraction of time.

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
small refactoring

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
amend series of removed backups

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
copy misc commits

commits other than anchor and outdated backup marks should be
cherry-picked

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
pretty formatting of commands

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>