[PATCH 00/11] Add ghost messages and fix thread linking

[David Bremner]

Austin Clements <aclements at csail.mit.edu> writes:

> This series modifies our database representation of messages that have
> been referenced by other messages, but for which we don't have the
> message itself.  Currently, we store this information as Xapian
> metadata, but this has several downsides for performance and
> complexity and results in hard-to-fix thread linking bugs.  This patch
> series implements "ghost messages", which replace this Xapian metadata
> with Xapian documents that look and act very much like regular message
> documents, but simply have no content.  This simplifies and speeds up
> our thread linking algorithm and fixes the currently broken thread
> linking test.

Other than some style / documentation quibbles already noted, 
the series looks good to me.

d