Support gcc -Werror=format-security which is used by default on Fedora.
ext2spice/ext2spice.c: format not a string literal and no format arguments
extflat/EFargs.c: likewise
windows/windCmdNR.c: likewise
Was looking to implement this feature and found it was already
implemented but is a secret feature.
Updated documentation and modified implementation so it is possible
a user can discover the feature via usage such as "quit -help -invalid"
like other commands.
Darryl L. Miles
Mamoru TASAKA
Tim Edwards