Patches: more fixes for bodystruct

[José Dapena Paz <jdapena igalia com>]

	Hi,

	These patches fix:
	* Not showing/finding properly the top mime part (i.e. when a message
is only a text/plain part).
	* Parse properly also video attachments
	* Handle and store properly the text part of message/rfc822

Changelog:
	* libtinymail-camel/camel-lite/bs/bodystruct.c: set proper part_spec
	of root part (it's empty, not "1").

	* libtinymail-camel/camel-lite/camel/providers/imap/camel-imap-folder.c,
	libtinymail-camel/tny-camel-bs-msg-receive-strategy.c:
	properly handle stored parts with part_spec == "" (as root part spec)

	* libtinymail-camel/camel-lite/camel/providers/imap/camel-imap-folder.c:
	detect properly also TEXT stored mime parts in bodystruct.

	* libtinymail-camel/camel-lite/bs/bodystruct.c: also
	consider VIDEO mime types with file/attachment format.



-- 
José Dapena Paz <jdapena igalia com>
Igalia