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.

Database/Keys.hs

@@ -235,7 +235,7 @@ reconcileStaged qh = do
   where
 	go cur indexcache = do
 		(l, cleanup) <- inRepo $ pipeNullSplit diff
-		changed <- procdiff l False
+		changed <- procdiff (map decodeBL' l) False
 		void $ liftIO cleanup
 		-- Flush database changes immediately
 		-- so other processes can see them.
@@ -262,7 +262,8 @@ reconcileStaged qh = do
 		-- perfect. A file could start with this and not be a
 		-- pointer file. And a pointer file that is replaced with
 		-- a non-pointer file will match this.
-		, Param $ "-G^" ++ toInternalGitPath (pathSeparator:objectDir)
+		, Param $ "-G^" ++ fromRawFilePath (toInternalGitPath $
+			toRawFilePath (pathSeparator:objectDir))
 		-- Don't include files that were deleted, because this only
 		-- wants to update information for files that are present
 		-- in the index.
@@ -277,7 +278,7 @@ reconcileStaged qh = do
 	procdiff (info:file:rest) changed = case words info of
 		((':':_srcmode):dstmode:_srcsha:dstsha:_change:[])
 			-- Only want files, not symlinks
-			| dstmode /= fmtTreeItemType TreeSymlink -> do
+			| dstmode /= decodeBS' (fmtTreeItemType TreeSymlink) -> do
 				maybe noop (reconcile (asTopFilePath file)) 
 					=<< catKey (Ref dstsha)
 				procdiff rest True
@@ -293,11 +294,11 @@ reconcileStaged qh = do
 		caches <- liftIO $ SQL.getInodeCaches ikey (SQL.ReadHandle qh)
 		keyloc <- calcRepo (gitAnnexLocation key)
 		keypopulated <- sameInodeCache keyloc caches
-		p <- fromRepo $ fromTopFilePath file
-		filepopulated <- sameInodeCache p caches
+		p <- fromRepo $ toRawFilePath . fromTopFilePath file
+		filepopulated <- sameInodeCache (fromRawFilePath p) caches
 		case (keypopulated, filepopulated) of
 			(True, False) ->
-				populatePointerFile (Restage True) key keyloc p >>= \case
+				populatePointerFile (Restage True) key (toRawFilePath keyloc) p >>= \case
 					Nothing -> return ()
 					Just ic -> liftIO $
 						SQL.addInodeCaches ikey [ic] (SQL.WriteHandle qh)