Put non-object tmp files in .git/annex/misctmp, leaving .git/annex/tmp for only partially transferred objects.

This allows eg, putting .git/annex/tmp on a ram disk, if the disk IO
of temp object files is too annoying (and if you don't want to keep
partially transferred objects across reboots).

.git/annex/misctmp must be on the same filesystem as the git work tree,
since files are moved to there in a way that will not work cross-device,
as well as symlinked into there.

I first wanted to put the tmp objects in .git/annex/objects/tmp, but
that would pose transition problems on upgrade when partially transferred
objects existed.

git annex info does not currently show the size of .git/annex/misctemp,
since it should stay small. It would also be ok to make something clean it
out, periodically.

Command/AddUrl.hs

@@ -114,7 +114,7 @@ addUrlFileQuvi relaxed quviurl videourl file = do
 			 - it later. -}
 			sizedkey <- addSizeUrlKey videourl key
 			prepGetViaTmpChecked sizedkey $ do
-				tmp <- fromRepo $ gitAnnexTmpLocation key
+				tmp <- fromRepo $ gitAnnexTmpObjectLocation key
 				showOutput
 				ok <- Transfer.download webUUID key (Just file) Transfer.forwardRetry $ const $ do
 					liftIO $ createDirectoryIfMissing True (parentDir tmp)
@@ -162,7 +162,7 @@ download url file = do
 	 - downloads, as the dummy key for a given url is stable. -}
 	dummykey <- addSizeUrlKey url =<< Backend.URL.fromUrl url Nothing
 	prepGetViaTmpChecked dummykey $ do
-		tmp <- fromRepo $ gitAnnexTmpLocation dummykey
+		tmp <- fromRepo $ gitAnnexTmpObjectLocation dummykey
 		showOutput
 		ifM (runtransfer dummykey tmp)
 			( do