Icepool

* Pass `star` parameter to `sub()` to recursive calls.

* `sub()` with `max_depth=None` now handles "monotonic" transitions with finite states. Full absorbing Markov chain calculation still under consideration.
* `sub()` no longer accept sequence input.
* Some minor formatting fixes.

* Standardize outcome count of `bernoulli`/`coin` and comparators.
* `standard_pool` now accepts a `dict` argument.
* `post_roll_counts` renamed again to `sorted_roll_counts`.
* `apply_sorted` can be subscripted to set the `sorted_roll_counts`.
* Pools are no longer resizable after creation.
* `Die.pool()` now has mandatory argument, now accepts a sequence argument to set `sorted_roll_counts`.

More renaming, experimental `sample()` methods.

* Both `Die` and `Deck` now have `quantities` rather than `weight`, `dups`, etc.
* Many `Die` methods moved to base class and are now available to `Deck`.
* "Eval" is now the full word "Evaluator".
* Parameter and method names are no longer prefixed with "num_".
* `reduce_weights` renamed back to `reduce`.
* `Deck`s can be formatted like `Die`.
* Allow formatting 0-1 probability.
* Experimental `sample()` methods for `OutcomeCountGenerator` and `OutcomeCountEvaluator`.

Development of deck API.

* Separate `Deal` class from `Deck`, roughly analogous to `Pool` vs. `Die`.
* `Deal` can now output multiple hands. The counts for each hand are provided in order to `eval.next_state`.
* `comb_row` now uses iterative rather than recursive memoization. This will prevent some stack overflows.
* `Pool`s are not permitted to be constructed using a raw `Die` or `Deck` argument.
* `reduce` argument of `Die.equals()` renamed to `reduce_weights`.

Significant API changes, experimental deck support.

* Experimental `Deck` class. API still very unstable.
* `Pool`s, `Deck`s, and internal Alignment now have a common base class `OutcomeCountGen`.
* `EvalPool` renamed to `OutcomeCountEval`.
* `Die` and `Deck` are now proper `Mapping`s with `keys`, `values`, and `items`.
* The above view types can also be accessed like sequences.
* A `Die` is now always considered not `equal()` to non-`Die`.
* `die[]` now works like a dict. Use `marginals[]` to marginalize dimensions.
* `Die`, `Pool`, and `Deck` now take a single sequence or mapping argument rather than a variable number of arguments.
* `Die`, `Pool`, and `Deck` now all have the same name for the second argument: `times`.
* `count_dice` renamed to `post_roll_counts`. No longer accepts `None`, use `[:]` instead.
* Linear algorithm for comparators on `Die`.
* Improvements to internal `Count` class.
* Add `clear_pool_cache` function.
* Forward `*extra_args` for `reroll, reroll_until, explode`.