Removed some non-ANSI-C strftime format strings ("%F") and
locale-dependent formats ("%c") from NSE scripts and libraries.
C99-specified %F was noticed by Alex Weber
(http://seclists.org/nmap-dev/2013/q2/300)
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)