Add arguments and unit tests to nl

[ras-drive]

nl needs many command line arguments.

-b, --body-numbering=STYLE	use STYLE for numbering body lines
-d, --section-delimiter=CC	use CC for separating logical pages
-f, --footer-numbering=STYLE	use STYLE for numbering footer lines
-h, --header-numbering=STYLE	use STYLE for numbering header lines
-i, --line-increment=NUMBER	line number increment at each line
-l, --join-blank-lines=NUMBER	group of NUMBER empty lines counted as one
-n, --number-format=FORMAT	insert line numbers according to FORMAT
-p, --no-renumber	do not reset line numbers at logical pages
-s, --number-separator=STRING	add STRING after (possible) line number
-v, --starting-line-number=NUMBER	first line number on each logical page
-w, --number-width=NUMBER	use NUMBER columns for line numbers
--help	display help and exit
--version	display version information and exit