ZVertexFilter: Added option for pids and validator

[rtysonCLAS12]

Simple fix to add pids of particles for which to filter based on zvertex. Added default to only electrons in Config.yaml.

Also added validator to plot before and after zvertex cuts. This is plotted for electrons, on which we cut in the validator, but also other particles which shouldn't (and aren't) cut on.

Example plots for electrons and pions outputted by validator:

[rtysonCLAS12]

Thanks Chris for fixing the example files and fortran bindings, I had missed those in the original commit

[rtysonCLAS12]

@c-dilks I've added the changes you recommended

[c-dilks]

Looking at the CI artifacts, any idea why there is a large spike here?

[rtysonCLAS12]

That's strange, maybe something to do with how the vertex is calculated fro electrons in the FT? The plots for the other particle types seem sensible.

[dglazier]

That's strange, maybe something to do with how the vertex is calculated fro electrons in the FT? The plots for the other particle types seem sensible.

Makes sense, there is no z-vertex position from the FT (no tracker). FT electrons should not have a z-vertex cut applied.

[rtysonCLAS12]

That's strange, maybe something to do with how the vertex is calculated fro electrons in the FT? The plots for the other particle types seem sensible.

Makes sense, there is no z-vertex position from the FT (no tracker). FT electrons should not have a z-vertex cut applied.

Ok thanks for pointing that out!