b9691601fa
- use a separate _barman:_barman user/group
- use /var/db/barman as the default datadir, setting appropriate
permissions (ie _barman:_barman / 750)
- make ${SYSCONFDIR}/barman.conf root:_barman & mode 640
- add README teaching how to configure _barman's crontab
Join work with Jean Gerard Pailloncy, tweaks & ok ajacoutot@