[leafnode-list] Binary blocking

[Andrew Cranson]

> Apart from filtering file size, you might be able to filter out all
> articles that match:
>
> ^Content-Type:.*(application|image|audio|video)/
>
> Particularly in leafnode-1. Does that work for you?
>
> Other than that, you can use only_groups_pcre to weed out the binaries
> from your group list. (Run fetchnews -f after changing that option.)

Filtering file size will accomplish what I wanted, thanks! :)