In Curve: Added numerical FD differentiation if derivative is not supplied. Added arc length computation based on the derivative. Added arc length parameterization (but this function is very slow.). In +util: Added fzero_vec.m and integral_vec.m, which call fzero and integral but take vector arguments.

function printSize(A)
    warning('Deprecated! Use printExpr() instead!');
    s = size(A);
    fprintf('%8s has size: [%d, %d]\n',inputname(1),s(1),s(2));
end