Enhancement - recurring tasks

- Implemented handleRecurringTasks.
- Implemented TDB::nextId.

src/TDB.cpp

@@ -196,6 +196,7 @@ int TDB::loadPending (std::vector <Task>& tasks, Filter& filter)
 
   try
   {
+    mId = 1;
     char line[T_LINE_MAX];
     foreach (location, mLocations)
     {
@@ -425,6 +426,12 @@ int TDB::gc ()
   return count;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+int TDB::nextId ()
+{
+  return mId++;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 FILE* TDB::openAndLock (const std::string& file)
 {