[getopt-sig] Option package requirements

[Russ Cox]

> But the requirement to occasionally do non-standard processing definitely
> exists, and so IMHO it should be supportable.

This is where we differ.  I admit that some programs
may want to do non-standard processing, but I believe
we should be discouraging this, and one of the best
ways is not to make any explicit attempts to support it.
It's not like using the standard option parser will be
the only way to parse the command-line.  If someone wants
a non-standard argument syntax, they can write their own
parser.  That's good discouragement.

Russ