Invalid values during Coordinate conversion.

🐞 Problem When converting from Cartesian to BL, we may run across a divide by zero error as discussed in #343. The same error can also be encountered when converting from Cartesian to Spherical with all x, y, and z zero.

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[shreyasbapat]

Change the implementation to this solves this.

def cart2sph(x, y, z):
    hxy = np.hypot(x, y)
    r = np.hypot(hxy, z)
    theta = np.arctan2(z, hxy)
    phi = np.arctan2(y, x)
    return r, theta, phi

[shreyasbapat]

Fixed in #351