validate secondary diagnosis to prevent duplication of primary diagnosis * leads to loss of duplicate diagnosis data on rendering of Rose object by template or as_tree() * rename ConstraintMethods 'check_eq_with' to 'check_vial_id' for consistency with 'check_secondary_diagnosis' validation method
separated validation profiles for new user created by a) copy/paste application message and b) user manager - username param now handled differently; 6 new tests for duplicate user first & last names
