Global: support --bar-width

src/data/help.txt

@@ -71,6 +71,7 @@ Display options:
     --percent-type <value>:      Set the percentage output type. 1 for percentage number, 2 for bar, 3 for both, 6 for bar only, 9 for colored number. Default is 1
     --bar-char-elapsed <str>:    Set the character to use in elapsed part. Default is '■'
     --bar-char-total <str>:      Set the character to use in total part. Default is '-'
+    --bar-width <?num>:          Set the width of the bar, in number of characters. Default is 10
     --bar-border <?value>:       Whether to show a border around the bar. Default is true
     --no-buffer <?value>:        Set if the stdout application buffer should be disabled. Default is false
     --size-ndigits <value>:      Set the number of digits to keep after the decimal point when formatting sizes