Merge branch 'prune_and_verify' into 'master'

docs/30_Configuration/50_File_transfer.job.md

docs/40_Usage/10_Backup.md

docs/40_Usage/30_Filetransfer.md

docs/40_Usage/40_Cronjob.md

docs/99_Glossary.md

jobs/transfer.job.dist

plugins/transfer/duplicity.sh

plugins/transfer/restic.sh

prune.sh

transfer.sh

verify.sh