obsolete and unknown options

[Tom Anderson]

From: "David Relson" <relson at osagesoftware.com>
> error exit and released bogofilter-0.92.4.  With that change, using
> obsoleted options (or totally bogus options) generates a message to
> stderr and bogofilter runs using the remaining (valid) options.

Sounds perfectly reasonable to me.  Ignore stuff you don't understand, run
with what you do, and use defaults for anything not provided.  What's the
problem with that?  I don't see any reason to exit for invalid options.
It's just noise, ignore it.

Tom