Network.write_touchstone doesn't write the noise information

[FournierVincent]

The Network.write_touchstone does write the S parameters but not the noise parameters as specified in the touchstone spec.
https://ibis.org/connector/touchstone_spec11.pdf

    nw = rf.Network(f=[76.0],s=[[[0,1 ],[0,1]]],z0=[[50, 50]],name='noisynw',f_unit='GHz')
    nw.set_noise_a(nw.frequency, 3.3, 0.2+0.2j, 250 )
    nw.noisy
    nw.write_touchstone(return_string=True)

'!Created with skrf (http://scikit-rf.org).\n# GHz S RI R 50.0 \n!freq ReS11 ImS11 ReS21 ImS21 ReS12 ImS12 ReS22 ImS22\n76.0 0.0 0.0 0.0 0.0 1.0 0.0 1.0 0.0\n'

[FournierVincent]

The methods for plotting (on a smith chart or ni rectangular) the noise parameters g_opt, nfmindb, g_opt, rn are missing.
Idem for NetworkSet.