Diffuse filter and smoother
Re-set default value for diffuse_kalman_tol
to 1e-6, i.e. the most often used value (i.e. the one in univariate version);
Extend use of diffuse_kalman_tol
to likelihood/filters
Re-set default value for diffuse_kalman_tol
to 1e-6, i.e. the most often used value (i.e. the one in univariate version);
Extend use of diffuse_kalman_tol
to likelihood/filters