Bug Fix - due date, colorization

- Fixed bug that caused colorization to be way, way off.  Silly
  mistake.
- Fixed bug whereby due dates and durations were stored as-is, but
  should have been converted.
- On a related note, added Date::toEpochString,
  Duration::operator (std::string).

src/TDB.cpp

@@ -36,6 +36,8 @@
 #include "TDB.h"
 #include "main.h"
 
+extern Context context;
+
 ////////////////////////////////////////////////////////////////////////////////
 //  The ctor/dtor do nothing.
 //  The lock/unlock methods hold the file open.
@@ -175,7 +177,7 @@ int TDB::load (std::vector <Task>& tasks, Filter& filter)
       numberStatusClauses != numberSimpleStatusClauses)
     loadCompleted (tasks, filter);
   else
-    std::cout << "# TDB::load optimization short circuit" << std::endl;
+    context.header ("load optimization short circuit");
 #else
   loadCompleted (tasks, filter);
 #endif