Enhancement - add

- Modified Record::get* methods to be const.
- Implemented TDB2::add.
- Renamed Task::valid to Task::validate.
- Implemented Task::setEntry to default creation time.
- Fixed bug where TDB2 was opening files "rw" instead of "r+".

src/TDB.cpp

@@ -342,7 +342,6 @@ bool TDB::writePending (const T& t)
         delay (0.1);
 
     fputs (t.compose ().c_str (), out);
-
     fclose (out);
     return true;
   }