Consider the following object chain.
If not multipart header -> body else if multipart header -> preamble -> part1 -> part2 -> ... -> trailor
header_data_type() return the type of the whole type. It is known from Content-Type: in the whole message header.
whole_message_body() returns body or part1 if multipart. whole_message_body_head() is same.
find_first_plaintext_message($args) return the first text/plain type object in the chain. This is useful in filter codes since filter system checks the first text field in a lot of cases.
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