big_num_math 4.2.3

Simple library for computations on large numbers.
Documentation 
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### BIG NUM MATH
Library for computations on large numbers.

- development notes: 
    1. little plan for new functions
    2. upcoming optimizations (memory consumption, speed up on some computations, …)
- functions only:
    - addition +substraction, 
    - multiplication +division
    - relation and decimal relation operators
    - order of magnitude
    - power
    - integer square root

### Usage Samples

##### power

```rust
let row = PlacesRow::new_from_u128(u128::MAX);
let pow = pow(&row, 500);
let number = pow.to_number();

assert!(number.starts_with("8312324609993336522"));
assert_eq!(19266, number.len());
```

##### division with remainder

```rust
let dividend = PlacesRow::new_from_str("3402823669209384634633746074317682114565556668744123").unwrap();
let divisor  = PlacesRow::new_from_str(  "14034568236692093846346337460345176821145655563453").unwrap();
let ratio = "242";        
let remainder = "6458155929897923817932408914149323848308022388497";
        
let ratrem = divrem(&dividend, &divisor).unwrap();
        
assert_eq!(ratio, ratrem.0.to_number());
assert_eq!(remainder, ratrem.1.to_number());
```

```rust
let dividend = Row::new_from_str("99999340282366920938463463374607431768211455").unwrap();
let divisor  = Row::new_from_usize(249);

let ratio     = Row::new_from_str("401603776234405304973748848894005750073138").unwrap();
let remainder = Row::new_from_usize(93);

let ratrem = divrem(&dividend, &divisor).unwrap();
assert_eq!(ratio, ratrem.0);
assert_eq!(remainder, ratrem.1);
```

##### decimal places relation

```rust
let number    = Row::new_from_str("1489754132134687989463132131").unwrap();
let comparand = Row::new_from_str(        "48645698946456531371").unwrap();
let decrel = rel_dec(&number, &comparand);

assert_eq!(RelDec::Greater((28, 20, 8)), decrel);
```

##### order of magnitude

```rust
let number_1 = PlacesRow::new_from_u128(3162277660168379331998893544432);
let number_2 = PlacesRow::new_from_u128(3162277660168379331998893544433);

assert_eq!(Oom::Precise(30), ord_of_mag(&number_1, OomKind::Strict));
assert_eq!(Oom::Precise(31), ord_of_mag(&number_2, OomKind::Strict));
assert_eq!(Oom::Precise(30), ord_of_mag(&number_2, OomKind::Loose));
```

##### square root

```rust
let test  = Row::new_from_str("9754610577924096936222542295378750190521").unwrap();
let proof = Row::new_from_u128(98_765_432_100_123_456_789);
assert_eq!(proof, heron_sqrt(&test));
```