attachment filenames explained and stuff

Hypermail currently uses the attachment name when saving, if it can find it.

I have made a quick fix in my version that prefixes all filenames with "att-". I would like this to be configurable somehow so that you can optionally make it into its own subdirectory and similarly. Perhaps by supporting some %-style thing.

I decided I had reasons enough to upload a 2a19 now. It is basically a 2a18+Haldane's patches+this patch. You find it at www.fts.frontec.se/~dast/hypermail/ as usual! The CVS server sources are tagged accordingly.

The From-parser is still a weak part in hypermail, but with my latest attempts I think I've reached a pretty good version that may be something to implement to show up in 2a20 or something.

--
             Daniel Stenberg - http://www.fts.frontec.se/~dast
   ech`echo xiun|tr nu oc|sed 'sx\([sx]\)\([xoi]\)xo un\2\1 is xg'`ol