stats: start to handle when --dry-run is called

- Change the stats output to "to be synced" instead of "was synced"
  when --dry-run is used on the command line
examples: change wording of simple shortcut example
app: forgot to set $lslar_file prior to downloading
stats: show stats when --dry-run is used

- Show how many files would be synced and how much data would be
  synced when --dry-run is called