These properties are <xs:sequence> and must be in this explicit order.

Fixes downloading attachments for some clients, in certain situations.
Range is zero based, fix ending byte count.
Remove dead code.
Use approximate size for attachment data.

Conflicts:
	framework/ActiveSync/lib/Horde/ActiveSync/Imap/Message.php
We want the actual size here, not the approximate size.
Tweak order of mail fields.
Tweak order of fields for appointment objects.