Reduce the writing frquency of partitioned-pipe

[MakisH]

While running the partitioned-pipe in an OpenFOAM Adapter custom build, I noticed that the results were approx. 160MB in size, which is, I think, unreasonable for what we need.

This increases the writeTime from 0.01 to 0.1. This is 10x fewer files, while 0.1s is still enough to capture the initial discontinuity (this may turn interesting later on in results comparisons).

I did not switch on results compression (i.e., making the output files binary), since eventually we may want to store them as reference results here and make some easy-to-check file comparisons, at least for the last time. If in the end we only check preCICE VTK files, we can enable compression everywhere.

@davidscn does this sound reasonable? Should we absolutely apply the same change to some other tutorial? If not, feel free to merge.

[davidscn]

Might be relevant when working on precice/openfoam-adapter#93