rename notwa candidates to internal, sort imports

thursday/candidates/__init__.py

@@ -1,7 +1,5 @@
 from .dlib import dlib_cube
 from .evolopy import make_evolopy
-from .nevergrad import NEVERGRAD2_OPTIMIZERS
-from .nlopt import nlopt_neldermead_cube
 from .fcmaes import (
     make_biteopt,
     make_csma,
@@ -12,7 +10,9 @@ from .fcmaes import (
     make_gclde,
     make_lclde,
 )
-from .notwa import make_birect, make_mercury, make_soo
+from .internal import make_birect, make_mercury, make_soo
+from .nevergrad import NEVERGRAD2_OPTIMIZERS
+from .nlopt import nlopt_neldermead_cube
 from .random import another_random_cube, quasirandom_cube
 from .scipy import (
     make_shgo,