Ghost sampler

[Andrey Abramov]

An empty sampler appearing at the beginning of the line. Eg. sampler d1 in example attached has no entries.

[Jochem Snuverink]

The manual http://www.pp.rhul.ac.uk/bdsim/manual/model_description.html#samplers-output says this:

Warning A sampler attached to the first item (therefore at the beginning of the beamline) may not record all primary particles. This is due to the bunch distribution having a finite length in z and some of the particles (typically half) start in front of the sampler. This is not an error, but as expected. It is best not to put a sampler on the first element, but to use the recorded primary coordinates in the output.

But I think you are right that perhaps we shouldn't put a sampler at the very first element for the all samplers. To be discussed.

[Jochem Snuverink]

proposed solution for sample,all;

1. don't put sampler at first element

2. put additional sampler at end of line. Proposed name: sampler_end;

[Jochem Snuverink]

fix issue #104 : for sample,all: 1.don't put sampler at first element 2.add sampler at the end

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