enh: Updated List bud
enh: Updated List bud

Added min/max-val functions for the list.

Added an in-place unique routine which removes
duplicates.

Forgot to make certain routines public.

Signed-off-by: Nick Papior <81a73bca3d342ffee33d7cf845fdbf77b6553831@gmail.com>

siesta-project/refype,siesta-project/buds,siesta-project/refype