Fixed multipart/form-data POSTs to comply to standards, and also fixed
it to work with de-facto browser behavior wrt charset handling. Thanks
to srb for pointing this out.
Fixed the foo.mimetype variables to contain only the content type, not
the whole header.
Added id->misc->post_parts to keep the MIME objects from
multipart/form-data around in case someone wants to look at all the
headers and parameters.