- persistent plot settings in ppclass (valid for all plots)

- a plot3d() class for 3D plots /planeto/tnalmd/runs/newref/isoline.py

- movies
        ## POUR ALLER PLUS VITE : http://matplotlib.org/users/shell.html
        ## POUR AVOIR UN MOVIE : http://matplotlib.1069221.n5.nabble.com/calling-show-twice-in-a-row-td22682.html

- tiles (pcolor)

- more complicated computations: derivatives, histograms, spectra, etc...

- implement the operator 'and' to concatenate files over time