New patches:

[unrevert
anonymous**20081019161114] 
<
> {
hunk ./mailboxThreading.ml 15
 
 class message (msg : Mailbox.message) =
   let msg_id = 
-    try Some (icase_assoc "Message-ID:" (fst msg))
+    try Some (icase_assoc "Message-ID" (fst msg))
     with Not_found -> None
   in
   let references = 
hunk ./mailboxThreading.ml 20
     let refs =
-      try Pcre.split ~pat:" " (icase_assoc "References:" (fst msg))
+      try Pcre.split ~pat:" " (icase_assoc "References" (fst msg))
       with Not_found -> []
     in
       refs
hunk ./mailboxThreading.ml 25
 (*      try
-	match List.filter valid_msg_id (Pcre.split ~pat:" " (icase_assoc "In-Reply-To:" (fst msg))) with
+	match List.filter valid_msg_id (Pcre.split ~pat:" " (icase_assoc "In-Reply-To" (fst msg))) with
 	  | [] -> refs
 	  | x::_ -> refs @ [x]
       with Not_found -> refs*)
hunk ./mailboxThreading.ml 30
   in
-  let subject = lazy (try icase_assoc "Subject:" (fst msg)
+  let subject = lazy (try icase_assoc "Subject" (fst msg)
 		      with Not_found -> "")
   in
 object
}

Context:

[Mailbox: fixed parsing continuation headers
flux@modeemi.fi**20081019160511] 
[Mailbox.parse_kv: use a custom function instead of Pcre to split keys-values in headers
flux@modeemi.fi**20081019160111] 
[MailboxThreadingTest: gc tuning is now optional, optional internizing, some profiling
flux@modeemi.fi**20081019151632] 
[mailboxThreadingTest.profile: added a rule that compiles native binary with -p; removed from mailboxThreadingtest.opt
flux@modeemi.fi**20081019141844] 
[Mailbox: moved internizing to be a parameter
flux@modeemi.fi**20081019140448] 
[Mailbox.parse_header: optimized by using prestudied regular expression
flux@modeemi.fi**20081019135937] 
[Makefile: fixed MailBoxthreadingTest rule dependencies
flux@modeemi.fi**20081019132428] 
[MailboxThreading: added
flux@modeemi.fi**20081019132233] 
[Commented debug messages
flux@modeemi.fi**20081019122009] 
[MailboxThreadingTest: added
flux@modeemi.fi**20081019120131] 
[Threading: added
flux@modeemi.fi**20081019120102] 
[mailboxThreadingTest: added rule
flux@modeemi.fi**20081016183309] 
[First import
flux@modeemi.fi**20080731092344] 
Patch bundle hash:
c432b4dcdb9b0caf5a2e9ac4831bd6f62432258b