BUGFIX %current_lvm_config was accessed improperly
Merge branch 'setup-storage_tn' of github.com:ThomasNeumann/setup-storage into setup-storage_tn

* 'setup-storage_tn' of github.com:ThomasNeumann/setup-storage:
  extend trace-mode
  add a trace-mode to command line arguments
  Hide line numbers from output.
  add informative output
  BUGFIX boolean condition is inverted
  BUGFIX remove call to unavailable function 'DEBUG()' (can be re-enabled later if WARN(), INFO(), DEBUG() are available)
  make get_label() and get_uuid() work the same way
  BUGFIX $gid is undefined if the device does not exist