Rename MIN_E and MAX_E functors, remove duplicate functor

Change MIN_E, MAX_E -> MIN_ELEMENT, MAX_ELEMENT following #396 (closed)

Remove from __init__ file duplicate functors' definitions based on the same composition (NINCONE and MAP_INPUT_SIZE)

Needs Analysis!932 (merged), Moore!1911 (merged), DaVinci!795 (merged)