This function will format a MAC address as colon-separated hex bytes.
It's really very simple: stdnse.tohex(mac, {separator=":"})
This commit updates all the instances I could find of the varying
convoluted attempts at performing this conversion.
Many scripts were documented as using timespecs (10s, 5000ms, etc) for
timeout script-args, but one 1 or 2 actually did. Now all timeout
script-args will accept timespecs, except those which took a number of
milliseconds, which remain unchanged.
Also fixed some documentation issues (missing script name in arg
description, missing nsedoc for args, etc)
