Built by Suit/Built by Alternate Colour:
=============================================

Define a fcs_is_parent_card(child, parent) macro, accordingly, and use it
wherever appropriate:

move_freecell_cards_on_top_of_stacks: 671.

Also make sure that the stuff with the foundations returning
PARENT_STATE_IS_NOT_SOLVEABLE is set.

Multiple Decks:
===============

Define a MAX_DECKS macro, and implement storage for multiple decks in
fcs_state_t. Then, make sure all the decks checks are made with loops.
(search for fcs_deck).


Empty Stacks:
=============

If by any card:
---------------

keep the algorithm as it is.

If cannot at all:
----------

calc_max_sequence_move = (num_freecells+1)

In move_non_top_stack_cards_to_founds:
Check only if the freecells can be filled

In move_stack_card_to_parent_on_the_same_stack:
Ditto.

In move_stack_cards_to_different_stacks:
Ditto.

In move_cards_to_a_different_parent:
Ditto.

move_sequences_to_free_stacks:
Eliminate completely

move_freecell_cards_to_empty_stack:
Eliminate completely

empty_stack_into_freecells:
Elminate completely.


If Kings Only:
--------------

calc_max_sequence_move =
(num_freecells+1) +
(((top_card==KING)&&(num_freestacks>0)) ? 1 : 0)

In move_non_top_stack_cards_to_founds:
Check only if the freecells can be filled

In move_stack_card_to_parent_on_the_same_stack:
Ditto.

In move_stack_cards_to_different_stacks:
Ditto.

In move_cards_to_a_different_parent:
Ditto.

move_sequences_to_free_stacks:
Kings Only

move_freecell_cards_to_empty_stack:
Kings Only

empty_stack_into_freecells:
Move to last place.



(Un/)Limited Sequence Move
==========================

Unlimited sequence move:
------------------------

calc_max_sequence_move == MAX_INT