switch from hslogger to purpose-built Utility.Debug

This uses a DebugSelector, rather than debug levels, which will allow
for a later option like --debug-from=Process to only
see debuging about running processes.

The module name that contains the thing being debugged is used as the
DebugSelector (in most cases; does not need to be a hard and fast rule).
Debug calls were changed to add that. hslogger did not display
that first parameter to debugM, but the DebugSelector does get
displayed.

Also fastDebug will allow doing debugging in places that are used in
tight loops, with the DebugSelector coming from the Annex Reader
essentially for free. Not done yet.

Annex/ExternalAddonProcess.hs

@@ -5,16 +5,18 @@
  - Licensed under the GNU AGPL version 3 or higher.
  -}
 
+{-# LANGUAGE OverloadedStrings #-}
+
 module Annex.ExternalAddonProcess where
 
 import qualified Annex
 import Annex.Common
 import Git.Env
 import Utility.Shell
+import Utility.Debug
 import Messages.Progress
 
 import Control.Concurrent.Async
-import System.Log.Logger (debugM)
 
 data ExternalAddonProcess = ExternalAddonProcess
 	{ externalSend :: Handle
@@ -91,7 +93,7 @@ startExternalAddonProcess basecmd pid = do
 			"Cannot run " ++ basecmd ++ " -- It is not installed in PATH (" ++ path ++ ")"
 
 protocolDebug :: ExternalAddonProcess -> Bool -> String -> IO ()
-protocolDebug external sendto line = debugM "external" $ unwords
+protocolDebug external sendto line = debug "Annex.ExternalAddonProcess" $ unwords
 	[ externalProgram external ++ 
 		"[" ++ show (externalPid external) ++ "]"
 	, if sendto then "<--" else "-->"