Rework sugar.logger and make activities just

redirect their output to a log.

shell/sugar-shell

@@ -26,13 +26,10 @@ import gtk
 import gobject
 import gst
 
-from sugar import logger
 from sugar import env
+from sugar import logger
 from sugar.profile import get_profile
 
-logger.cleanup()
-logger.start('shell')
-
 sys.path.insert(0, env.get_shell_path())
 
 from view.Shell import Shell
@@ -97,6 +94,9 @@ def _shell_started_cb():
 def main():
     gobject.idle_add(_shell_started_cb)
 
+    logger.setup_logs_dir()
+    logger.start('shell')
+
     _save_session_info()
     _start_matchbox()
     _setup_translations()