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[Václav Šmilauer <eudoxos@xxxxxxxx>]

> p.s. How can we do something like this? For now, it (apparently) runs in 
> the background so that the second definition of velGrad is used for 
> almost 2000 steps :
> 
> O.cell.velGrad=Matrix3(0,5,0,0,0,0, 0,0,-5)
> O.run(1000)
> O.cell.velGrad=Matrix3(1,0,0,0,0,0, 0,0,0)
> O.run(1000)

O.run(1000); O.wait()

or equivalently

O.run(1000,True)

otherwise the O.run() returns immediately and the velGrad is changed
just after a few steps.