Use g_timeout_add_seconds() for power efficiency

This attempts to align second-granularity wakeups across the system,
reducing CPU wakeups a little.

I considered all timeouts of duration 1 second or greater, and moved
the non-timing-critical ones to g_timeout_add_seconds(). (Actually,
I didn't find any that I felt were timing-critical)

src/sugar/activity/activity.py

@@ -184,8 +184,8 @@ class ActivityToolbar(gtk.Toolbar):
 
     def __title_changed_cb(self, entry):
         if not self._update_title_sid:
-            self._update_title_sid = gobject.timeout_add(
-                                                1000, self.__update_title_cb)
+            self._update_title_sid = gobject.timeout_add_seconds(
+                                                1, self.__update_title_cb)
 
     def __update_title_cb(self):
         title = self.title.get_text()