Fix path operation for ToxAnalysis output

Mohcine Chraibirequested to merge
fix_path_toxAnalysis into develop

If we run the 0_demo like this

jpscore JuPedSim/jpsfire_ini.xml

then this happens

Screen_Shot_2018-10-20_at_23.53.35

This should fix this bug. If you agree, please accept MR.

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