btrbk: add -L, --long options (shortcut for --format=long)

btrbk

@@ -335,6 +335,7 @@ options:
    -q, --quiet               be quiet (do not print backup summary)
    -l, --loglevel=LEVEL      set logging level (warn, info, debug, trace)
    -t, --table               change output to table format
+   -L, --long                change output to long format
        --format=FORMAT       change output format, FORMAT=table|long|raw
    -S, --print-schedule      print scheduler details (for the "run" command)
        --progress            show progress bar on send-receive operation
@@ -4889,6 +4890,7 @@ MAIN:
     'loglevel|l=s'       => \$loglevel,
     'progress'           => \$show_progress,
     'table|t'            => sub { $output_format = "table" },
+    'long|L'             => sub { $output_format = "long" },
     'format=s'           => \$output_format,
     'print-schedule|S'   => \$print_schedule,
     'lockfile=s'         => \$lockfile_cmdline,