hooked up git-annex-shell transferinfo

Finally done with progressbars!

doc/design/assistant/progressbars.mdwn

@@ -17,36 +17,14 @@ This is one of those potentially hidden but time consuming problems.
 ## uploads
 
 Each individual remote type needs to implement its own support for calling
-the ProgressCallback as the upload progresses.
-
-* git: Done, with one exception: `git-annex-shell sendkey` runs `rsync
-  --server --sender` and in that mode it does not report progress info.
-  So downloads initiated by other repos do not show progress in the repo
-  doing the uploading. 
-  
-  Maybe I should
-  write a proxy for the rsync wire protocol that can tell what chunk of the
-  file is being sent, and shim it in front of the rsync server? Sadly,
-  the protocol is insane.
-
-  Another idea: Invert things. Make `git-annex-shell sendkey` run 
-  `rsync -e 'cat'`, so it treats the incoming ssh connection as the server.
-  (cat probably won't really work; bidirectional pipe needed).
-  Run rsync in `--server` mode on the *client* side, piped to ssh.
-  Now the `git-annex` side doesn't have a progress bar (but it can poll the
-  file size and produce its own), `git-annex-shell` side does have a progress
-  bar.
-
-  Less crazy, but probably harder idea: Multiplex progress info from client
-  back to server over the ssh connection, and demultiplex at server end.
-  Or, use a separate ssh connection, and let ssh connection caching handle
-  the multiplexing.
+the MeterUpdate callback as the upload progresses.
 
+* git: **done**
 * rsync: **done**
 * directory: **done**
 * web: Not applicable; does not upload 
-* S3
-* bup
+* S3: TODO
+* bup: TODO
 * hook: Would require the hook interface to somehow do this, which seems
   too complicated. So skipping.