Function fractal_analysis::read_window_not_normalised

pub fn read_window_not_normalised(
    folder: &str, 
    filename: &str, 
    extension: &str, 
    window_size: usize, 
    offset: usize, 
    chan_amt: usize
) -> Vec<Vec<f64>>

Reads window_size samples from a given EEG.

Assumes the following:

• Each EEG channel is in a different file
• Said files are named identically, apart from a serial number
• The numbers run from 1 to chan_amt.