* e-msg-composer.c (handle_multipart_alternative,
handle_multipart, e_msg_composer_new_with_message): Use
CamelContentType instead of GMimeContentField.
* e-msg-composer-attachment.c (e_msg_composer_attachment_edit):
* e-msg-composer-attachment-bar.c (update, attach_to_multipart):
Use CamelContentType, and use the header_content_type_* functions
rather than operating on the structure by hand.
svn path=/trunk/; revision=7188