Smoothed z-score peaks detector

Description

Rust implementation for Smoothed z-score algorithm.

Usage

Add this to your Cargo.toml:

toml [dependencies] smoothed_z_score = "0.1"

and this to your crate root:

rust extern crate smoothed_z_score;

Example usage

Consider this dataset (from the original stackoverflow reply):

```rust use smoothedzscore::{Peak, PeaksDetector, PeaksFilter};

fn main() {
    let input = vec![
        1.0, 1.0, 1.1, 1.0, 0.9, 1.0, 1.0, 1.1, 1.0, 0.9, 1.0, 1.1, 1.0, 1.0, 0.9, 1.0, 1.0, 1.1, 1.0,
        1.0, 1.0, 1.0, 1.1, 0.9, 1.0, 1.1, 1.0, 1.0, 0.9, 1.0, 1.1, 1.0, 1.0, 1.1, 1.0, 0.8, 0.9, 1.0,
        1.2, 0.9, 1.0, 1.0, 1.1, 1.2, 1.0, 1.5, 1.0, 3.0, 2.0, 5.0, 3.0, 2.0, 1.0, 1.0, 1.0, 0.9, 1.0,
        1.0, 3.0, 2.6, 4.0, 3.0, 3.2, 2.0, 1.0, 1.0, 0.8, 4.0, 4.0, 2.0, 2.5, 1.0, 1.0, 1.0
    ];
    let output: Vec<_> = input
        .into_iter()
        .enumerate()
        .peaks(PeaksDetector::new(30, 5.0, 0.0), |e| e.1)
        .map(|((i, _), p)| (i, p))
        .collect();
    assert_eq!(output, vec![
        (45, Peak::High), (47, Peak::High), (48, Peak::High), (49, Peak::High),
        (50, Peak::High), (51, Peak::High), (58, Peak::High), (59, Peak::High),
        (60, Peak::High), (61, Peak::High), (62, Peak::High), (63, Peak::High),
        (67, Peak::High), (68, Peak::High), (69, Peak::High), (70, Peak::High),
    ]);
}

```