11/// @brief core-level (very general) derived classes that wrap widely-used methods of the ResidueLevelTask interface. These are used by higher-level TaskOperations that allow the user to configure the behavior of PackerTasks that are created by TaskFactory.
55// if an amino acid is not present (false) in the boolean vector, then do not allow it at this position. The boolean vector is a 20-length vector in alphabetical order by one-letter code.