Sync Feedback

- Added a detailed sync summary message, indicating what happened.
- Improved and localized the feedback messages for the sync command.
- Added color to the add/modify feedback, matching the merge command.
- Enabled the sync timer for debugging output.

src/Context.h

@@ -117,7 +117,7 @@ public:
 
   Timer                               timer_init;
   Timer                               timer_load;
-  Timer                               timer_synch;
+  Timer                               timer_sync;
   Timer                               timer_gc;
   Timer                               timer_filter;
   Timer                               timer_commit;