[Paraview] time aware custom reader

[Moreland, Kenneth]

> Oh yes, thanks, that is a useful remark. It could be used to interpolate
> the solutions between the requested timesteps... not quite so rare :)

There actually already is a filter that does that: Temporal Interpolator.  Unless your file format has special information that suggests a better than linear interpolation, you can use the existing filter to save yourself some time.

-Ken