Fix so correctly gets number of points without errors

- Finding points in polar areas that avoids dividing by zero errors

- Small errors in `overlap.py` to get overlap function working.

- Raise an exception if the shear is too high when trying to find the baseline affine

- Catch divide by 0 errors when getting the number of points to place in `centroids.py`

- Correctly find the number of points without producing errors in `centroids.py`

## [1.1.0]

### Added

    Parameters

    ___________

    target_distance_km : int

        The target distance to maintin between points

        The target distance to maintin between points in km

    latitude : int

        the latitude where points are needed

        the latitude where points are needed in degrees

    radius : int

        radius of the planetary body

        radius of the planetary body in km

    Returns

    _______

    num_points : int

        Number of points needed to maintin target distance

        Number of points needed to maintin target distance at specified latitude

    """

    # Convert to radians

    target_distance_rad = target_distance_km / radius

    # Calculate longitudal distance between two points

    try:

        longitudinal_distance = 2 * math.asin(math.sqrt(math.sin(target_distance_rad/2)**2 / (math.cos(math.radians(latitude))**2)))

    # If given latitude is too close to 90 or 270, taking the cosine of it will give 0, so will then have a divide by 0 error.

    except:

        log.info(f"Math domain error at {latitude}, skipping")

        return None

    # Calculate the circumference of the planetary body at the given latitude

    body_circumference = 2 * math.pi * radius * math.cos(math.radians(latitude))

    # Calculate points needed

    num_points = int(body_circumference / longitudinal_distance) + 1

    # Convert latitude to radians

    lat_rad = math.radians(latitude)

    # Find the circumference of the planetary body

    circumference = 2 * math.pi * radius * math.cos(lat_rad)

    # Calculate the number of points

    num_points = int(circumference/target_distance_km)

    return num_points