[Paraview] Generate Programmable Sources with Timesteps

[Utkarsh Ayachit]

> Maybe the last variable 'req_timesteps[0]' is wrong, isn't it?
> My code is working with 'req_time'.

That's correct. I fixed it the Wiki.

> Then I have one question.
> What does the function SetOutputTimesteps() of RequestInformation means?
> I tested to remove the block, but the source still works as before.


SetOutputTimesteps tells the pipeline what timesteps this source
produces. VTK will not call RequestData() on a filter when time value
requested changes unless the filter said it was time-dependent.

Utkarsh