ADIOS: int16-type particle attributes do not compile

[BeyondEspresso]

The voronoiCellId-attribute of the particle merger is an int16, which is not (yet) implemented in include/picongpu/traits/AdiosToPIC.tpp. For this reason, the current dev-branch does not compile with both particle merger and ADIOS on. It would be an easy fix to also include int16-types there. Is there any deeper reason why this should not be done?

Alternatively, I could also modify the type of the voronoiCellId-attribute in speciesAttributes.param to int32, which I have done as a quick workaround for a simulation.

Before I open a pull request, I would like to hear your opinion on which route you prefer.

[ax3l]

I don't think ADIOS supports int16 at all, therefore better change the voronoiCellId to int32 ... :-S

We might just exclude the attribute from file I/O? I don't think its really needed, since it's a temporary property (similar to multiMask).

Update: uh wait, ADIOS should support int16_t as adios_short (implemented as fixed size on all platforms, see ornladios/ADIOS#187). Yes, just add this trait and you should be good to go! :)

[ax3l]

fixed with #2929, thanks to @BeyondEspresso!