NO_SHEAR_MODES not working properly in ns3d

There seem to be several problems with the NO_SHEAR_MODES boolean parameter in ns3d:

1. There are two NO_SHEAR_MODES boolean parameters: one in params.NO_SHEAR_MODES and one in params.oper.NO_SHEAR_MODES. They seem to be independant.

2. Setting params.oper.NO_SHEAR_MODES=True before starting a simulation does not prevent energy from growing into shear modes. Opening such a simulation in ipython after starting and testing the NO_SHEAR_MODES parameters give:

In [1]: from fluidsim import load_sim_for_plot

In [2]: sim = load_sim_for_plot()
*************************************
Program fluidsim
sim:                <class 'fluidsim.solvers.ns3d.strat.solver.Simul'>
sim.oper:           <class 'fluidsim.operators.operators3d.OperatorsPseudoSpectral3D'>
sim.output:         <class 'fluidsim.solvers.ns3d.strat.output.Output'>
sim.state:          <class 'fluidsim.solvers.ns3d.strat.state.StateNS3DStrat'>
sim.time_stepping:  <class 'fluidsim.solvers.ns3d.time_stepping.TimeSteppingPseudoSpectralNS3D'>
sim.init_fields:    <class 'fluidsim.solvers.ns3d.init_fields.InitFieldsNS3D'>
sim.forcing:        <class 'fluidsim.solvers.ns3d.forcing.ForcingNS3D'>

solver ns3d.strat, RK4 and sequential,
type fft: fluidfft.fft3d.with_pyfftw
nx =      4 ; ny =      4 ; nz =      4
Lx = 6 ; Ly = 6 ; Lz = 1
path_run =
/.fsnet/project/watu/2019/19INTSIM/sim_data/waves_coriolis/ns3d.strat_ampl0.035_360x360x60_V6x6x1_2020-04-08_14-18-51
init_fields.type: constant

Initialization outputs:
sim.output.phys_fields:       <class 'fluidsim.base.output.phys_fields3d.PhysFieldsBase3D'>
sim.output.spatial_means:     <class 'fluidsim.solvers.ns3d.strat.output.spatial_means.SpatialMeansNS3DStrat'>
sim.output.spectra:           <class 'fluidsim.solvers.ns3d.strat.output.spectra.SpectraNS3DStrat'>
sim.output.spect_energy_budg: <class 'fluidsim.solvers.ns3d.strat.output.spect_energy_budget.SpectralEnergyBudgetNS3DStrat'>

Memory usage at the end of init. (equiv. seq.): 181.51171875 Mo
Size of state_spect (equiv. seq.): 0.003072 Mo

In [3]: sim.params.oper.NO_SHEAR_MODES
Out[3]: False

In [4]: sim.params.NO_SHEAR_MODES
Out[4]: False 

Using load_state_phys_file instead of load_sim_for_plot gives the same result.