zbackup vars
zbackup proc
fix
fix
txt
zbackup docs
 -travis check this repo
fix /usr/local prefix
 remove zbackupdir to default backupdir
-travis in this branch
man path fix
fix log message
hardcode tararg in zbackup type
fix archivename
check and init zbackup repo
 - Removed absolute patch to zbackup binary (in $PATH we trust)
 - Updated zbackup documentation and config file section
 - Moved check for existence of the zbackup repo in front of the
   actual snapshot/backup creation (no need to fail late in the
   process)
 - Removed superflous $tarball variable from do_backup_zbackup
 - Updated zbackup logging texts
 - Added zbackup to the --help output
 - Added list of available backup types
   to configuration file
 - Eliminated redundant variable in do_backup_rsnap
 - The purge action now only works for tar and local rsync archives
   (zbackup repos would be corrupted, rsnap does its own retention)
 - Updated documentation accordingly
 - Added description of zbackup to the documentation