Back in Time release 1.1.22

Written for Back In Time by Germar on 2017-10-28

Fix some minor bugs and backport from 1.2.0

Changelog:- fix bug: stat free space for snapshot folder instead of backintime folder (https://github.com/bit-team/backintime/issues/733)
- backport bug fix: backintime root crontab doesn't run; missinng line-feed 0x0A on last line (https://github.com/bit-team/backintime/issues/781)
- backport bug fix: can't open files with spaces in name (https://github.com/bit-team/backintime/issues/552)