Make sure modifications to a message or its parts become visible in the message stream.

* include/mailutils/sys/body.h (_mu_body)<rawstream>: New member.
* include/mailutils/sys/message.h (_mu_message)<rawstream>: New member.
* libmailutils/mailbox/body.c: Rewrite. Return the specially crafted
"body-stream" for user I/O operations. Writes to that stream trigger
creation of a temporary stream (write-through mode) which will be used
for subsequent I/O.
* libmailutils/mailbox/msgbody.c (mu_message_get_body): Use msg->rawstream.
* libmailutils/mailbox/msgheader.c (message_header_fill): Do not
call mu_message_get_streamref, as that can result in endless recursion.
Use msg->rawstream instead.
* libmailutils/mailbox/msgref.c (_mu_message_free): Destroy both
rawstream and outstream.
* libmailutils/mailbox/msgstream.c (mu_message_set_stream): Set
rawstream.
(mu_message_get_stream): Create outstream as needed.
(mu_message_get_streamref): If the message has been modified,
create the outstream and return it to the caller. This way, the
modifications become visible via the stream interface.
* libmailutils/tests/Makefile.am: Add new testcases.
* libmailutils/tests/testsuite.at: Likewise.
* libmailutils/tests/modmesg.c: New file.
* libmailutils/tests/modmesg00.at: New file.
* libmailutils/tests/modmesg01.at: New file.
* libmailutils/tests/modmesg02.at: New file.
* libmailutils/tests/modmesg03.at: New file.
* mh/mhn.c: Fix message reference counting.

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