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test  experiment : ideal_2D_oce 
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purpose: Shows that the residual mean circulation is becoming small 
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at the Equilibrium (Bolus cancel the Euleurian circ.) and is function 
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of the diapycnal mixing. 
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Set up: 
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Idealized 2D global ocean with flat bathymetry and no continent, 
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symetric relative to the Eq. 
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Forcing: zonal wind stress and surface temp. relaxation toward a 
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"realistic" SST (function of Latitude). 
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To reduce diapycnal mixing, "exotic" parameters are used (and tested) 
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in this testexperiment: 
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a) vertical discretization: interface at the middle (use delRc) 
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b) GM advect form 
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c) use Visbeck 
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d) GM advect(Euler+Bolus) and Flux Limit Adv scheme. 
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e) 3 different timesteps (MOM,FS,Tracer) 
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f) oceanic exp using stagger time stepping 
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g) oceanic exp using cg2dTargetResWunit 