moved transfer queueing out of watcher and into committer

This cleaned up the code quite a bit; now the committer just looks at the
Change to see if it's a change that needs to have a transfer queued for it.
If I later want to add dropping keys for files that were removed, or
something like that, this should make it straightforward.

This also fixes a bug. In direct mode, moving a file out of an archive
directory failed to start a transfer to get its content. The problem
was that the file had not been committed to git yet, and so the transfer
code didn't want to touch it, since fileKey failed to get its key.
Only starting transfers after a commit avoids this problem.

Assistant/Types/Changes.hs

@@ -8,20 +8,26 @@
 module Assistant.Types.Changes where
 
 import Types.KeySource
+import Types.Key
 import Utility.TSet
 
 import Data.Time.Clock
 
-data ChangeType = AddChange | LinkChange | RmChange | RmDirChange
+data ChangeInfo = AddChange Key | LinkChange (Maybe Key) | RmChange | RmDirChange
 	deriving (Show, Eq)
 
+changeInfoKey :: ChangeInfo -> Maybe Key
+changeInfoKey (AddChange k) = Just k
+changeInfoKey (LinkChange (Just k)) = Just k
+changeInfoKey _ = Nothing
+
 type ChangeChan = TSet Change
 
 data Change
 	= Change 
 		{ changeTime :: UTCTime
 		, changeFile :: FilePath
-		, changeType :: ChangeType
+		, changeInfo :: ChangeInfo
 		}
 	| PendingAddChange
 		{ changeTime ::UTCTime
@@ -44,11 +50,10 @@ isInProcessAddChange :: Change -> Bool
 isInProcessAddChange (InProcessAddChange {}) = True
 isInProcessAddChange _ = False
 
-finishedChange :: Change -> Change
-finishedChange c@(InProcessAddChange { keySource = ks }) = Change
+finishedChange :: Change -> Key -> Change
+finishedChange c@(InProcessAddChange { keySource = ks }) k = Change
 	{ changeTime = changeTime c
 	, changeFile = keyFilename ks
-	, changeType = AddChange
+	, changeInfo = AddChange k
 	}
-finishedChange c = c
-
+finishedChange c _ = c