wip RawFilePath 2x git-annex find speedup

Finally builds (oh the agoncy of making it build), but still very
unmergable, only Command.Find is included and lots of stuff is badly
hacked to make it compile.

Benchmarking vs master, this git-annex find is significantly faster!
Specifically:

	num files	old	new	speedup
	48500		4.77	3.73	28%
	12500		1.36	1.02	66%
	20		0.075	0.074	0% (so startup time is unchanged)

That's without really finishing the optimization. Things still to do:

* Eliminate all the fromRawFilePath, toRawFilePath, encodeBS,
  decodeBS conversions.
* Use versions of IO actions like getFileStatus that take a RawFilePath.
* Eliminate some Data.ByteString.Lazy.toStrict, which is a slow copy.
* Use ByteString for parsing git config to speed up startup.

It's likely several of those will speed up git-annex find further.
And other commands will certianly benefit even more.

Annex/Content.hs

@@ -483,7 +483,7 @@ moveAnnex key src = ifM (checkSecureHashes key)
 			fs <- map (`fromTopFilePath` g)
 				<$> Database.Keys.getAssociatedFiles key
 			unless (null fs) $ do
-				ics <- mapM (populatePointerFile (Restage True) key dest) fs
+				ics <- mapM (populatePointerFile (Restage True) key (toRawFilePath dest) . toRawFilePath) fs
 				Database.Keys.storeInodeCaches' key [dest] (catMaybes ics)
 		)
 	alreadyhave = liftIO $ removeFile src
@@ -650,7 +650,7 @@ removeAnnex (ContentRemovalLock key) = withObjectLoc key $ \file ->
 	-- Check associated pointer file for modifications, and reset if
 	-- it's unmodified.
 	resetpointer file = ifM (isUnmodified key file)
-		( depopulatePointerFile key file
+		( depopulatePointerFile key (toRawFilePath file)
 		-- Modified file, so leave it alone.
 		-- If it was a hard link to the annex object,
 		-- that object might have been frozen as part of the