Bug Fix - nag

- TDB::gc now displays a header message.
- nag function now piggy-backs on existing locked TDB.

src/TDB.cpp

@@ -196,6 +196,8 @@ int TDB::loadPending (std::vector <Task>& tasks, Filter& filter)
 
   try
   {
+    mPending.clear ();
+
     mId = 1;
     char line[T_LINE_MAX];
     foreach (location, mLocations)
@@ -371,6 +373,8 @@ int TDB::gc ()
 {
   int count = 0;
 
+  context.header ("gc");
+
   // Set up a second TDB.
   Filter filter;
   TDB tdb;