smallbigint 1.0.0

# Smallbigint

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A wrapper around `num_bigint::BigUint` and `num_bigint::BigInt` that
stays out of the heap for small values.

In the current implementation, we go to the heap for anything that
doesn't fit in 32 bits.

This crate already has a lot of relevant methods, but it is not really complete
yet. Patches are welcome!

## To do, and important:

- Implement `std::fmt::{Binary, LowerHex, Octal, UpperHex}` (easy?)
- Implement `num_bigint::{ToBigInt, ToBigUint}`

## Other traits and methods still to be implemented:

- Bit operations
- `num_traits::Num` (easy?)
- `num_traits::Signed`
- `num_traits::Unsigned`
- `num_integer::Integer`
- `num_integer::Roots`
- `std::iter::Product`
- `std::iter::Sum`
- Other methods implemented directly on BigInt, BigUint

## Not done and seems hard:

- `num_traits::pow::Pow`

# License

This project is licensed under either of

 * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
   http://www.apache.org/licenses/LICENSE-2.0)
 * MIT license ([LICENSE-MIT](LICENSE-MIT) or
   http://opensource.org/licenses/MIT)

at your option.

### Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in this project by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.