fix small bug in poisson_fft + new version of stretching operator encompassing the resolution of the linearized stretching equation

add SFD stuff (ie: method to get the filtered solution (=the base flow) needed to perform global linear stability analysis)

Update single precision patch. Add RMI example (need further tests, fix initial condition). Improve baroclinic operator.

add hemisphere example + dump/restart in examples + add monitor printing velocity/vorticity profiles

beginning of problems fixing in Momentum force computation and vorticity penalization + add absorption at the oulet + update of FlowAroundSphere bench

Add licence header. Add biblio (Noca)

Back to previous commit to (try to) fix bug in git : it loses all history in case of file/rep renaming.

update TaylorGreen example, replace dtAdvecCrit method_key by dtCrit, add default filename in dt_adapt operator