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Improving EXOGAM simu with outer segmentation + simulation in spherical flanges and cartesian coordinates + analysis of EXOGAM in cartesian and spherical coordinates

+ Add a dump funciton in the data class

now.

[GaseousDetectorScorerers] time for each step is the mean of time at the begining and at the end of each step

[EventGeneratorAlphaDecay] Force the GlobalTime to random following the decay law associated to the activity of the sample