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/Filter.cpp

@@ -42,8 +42,6 @@ bool Filter::pass (const Record& record) const
   // but it doesn't match, fail.
   foreach (att, (*this))
   {
-// TODO std::cout << "Filter::pass " << att->name () << "=" << att->value () << std::endl;
-
     // If the record doesn't have the attribute, match against a default one.
     // This is because "att" may contain a modifier like "name.not:X".
     if ((r = record.find (att->name ())) == record.end ())