TODO/IDEAS/KNOWN PROBLEMS
-------------------------
  - possibility to restore time frames (incl. deleted files)
    realizable by listing each backup and restore from 
    oldest to the newest, problem: not performant
  - search file in all backups function and show available
    versions with backups date (list old avail since 0.6.06)
  - edit profile opens conf file in vi 
  - implement log-fd interpretation
  - add a duplicity option check against the options pending 
    deprecation since 0.5.10 namely --time-separator
                                    --short-filenames
                                    --old-filenames
  - add 'exclude_<command>' list usage eg. exclude_verify
  - a download/install duplicity option
  - bug: on key import it tries to import again and fails because 
    of already existing key, probably caused by legacy gpgkey 
  - hint on install software if a piece is missing
  - featreq 2995409: Prevent concurrent runs for same profile
  - featreq 3042778: check success of commands and react in batches 
    e.g. backup_AND_verify_AND_purge, pre_and_bkp_and_post
  - import/export profile from/to .tgz function !!!
