implemented old Richih wishlist about remote/uuid info

* info: Can now display info about a given uuid.
  * Added to remote/uuid info: Count of the number of keys present
    on the remote, and their size. This is rather expensive to calculate,
    so comes last and --fast will disable it.
  * Git remote info now includes the date of the last sync with the remote.

Remote/Git.hs

@@ -159,7 +159,7 @@ gen r u c gc
 			, availability = availabilityCalc r
 			, remotetype = remote
 			, mkUnavailable = unavailable r u c gc
-			, getInfo = return $ gitRepoInfo r
+			, getInfo = gitRepoInfo new
 			, claimUrl = Nothing
 			, checkUrl = Nothing
 			}