Patch: return first latest messages in tny_folder_get_headers

[José Dapena Paz <jdapena igalia com>]

	Hi,

	This patch changes the order we return the headers in
tny_camel_folder_get_headers, so that we obtain first latest stored
messages instead of first stored.

	This speeds up the perceived speed of the header list store, and views
based on it, as we'll be showing first the latest messages, and these
ones are usually the most interesting user wants to see in large
folders.

	Changelog entry:
	* libtinymail-camel/tny-camel-folder.c
	(tny_camel_folder_get_headers_default): get headers now
	returns the headers in the reverse order (first we return
	latest messages). This makes tinymail behave better in the
	usual context (reading the newest messages).

-- 
José Dapena Paz <jdapena igalia com>
Igalia