agent-tk 0.4.0

`agent-tk` (`agent toolkit/tasks-knowledge`) is a crate for the development of autonomous agents using Rust, with an emphasis on tasks and knowledge based agents. This project is part of the [auKsys](http://auksys.org) project.
Documentation 
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pub(crate) fn haversine_distance(
  longitude_a: f64,
  latitude_a: f64,
  longitude_b: f64,
  latitude_b: f64,
) -> f64
{
  let r = 6371.0 * 1e3;

  let d_lat: f64 = (latitude_b - latitude_a).to_radians();
  let d_lon: f64 = (longitude_b - longitude_a).to_radians();
  let lat1: f64 = (latitude_a).to_radians();
  let lat2: f64 = (latitude_b).to_radians();

  let a = ((d_lat / 2.0).sin()) * ((d_lat / 2.0).sin())
    + ((d_lon / 2.0).sin()) * ((d_lon / 2.0).sin()) * (lat1.cos()) * (lat2.cos());
  let c = 2.0 * ((a.sqrt()).atan2((1.0 - a).sqrt()));

  r * c
}