Task Validation

- Fixed validation bug whereby recurring child tasks inherited the
  parent status ("recurring") instead of the expected "pending".
- Modified 'add' command to code duplicated in Task::validate.
- Cleaned up associated bug.period.t unit test.

src/TDB2.cpp

@@ -483,10 +483,13 @@ void TDB2::set_location (const std::string& location)
 
 ////////////////////////////////////////////////////////////////////////////////
 // Add the new task to the appropriate file.
-void TDB2::add (const Task& task)
+void TDB2::add (Task& task)
 {
 //  std::cout << "# TDB2::add\n";
 
+  // Ensure the task is consistent, and provide defaults if necessary.
+  task.validate ();
+
   // If the tasks are loaded, then verify that this uuid is not already in
   // the file.
   if (!verifyUniqueUUID (task.get ("uuid")))
@@ -513,10 +516,13 @@ void TDB2::add (const Task& task)
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-void TDB2::modify (const Task& task)
+void TDB2::modify (Task& task)
 {
 //  std::cout << "# TDB2::modify\n";
 
+  // Ensure the task is consistent, and provide defaults if necessary.
+  task.validate ();
+
   // Update task in either completed or deleted.
   // TODO Find task, overwrite it.
   std::string status = task.get ("status");