Epix

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* First implementation of BBF quanta generator (57)

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* Save primary particle position (56)
* Set arg defaults (55)

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* Add NR filter before quanta generation (53)
* Update energy selection for Kr83m model (52)

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* Fixed field map loading (50)

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* Update efield handler to maps format (49)

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* Fix clustering indexing (45)
* Treatment for empty data (40)
* Fix for NEST interaction classification parameters (44)
* Enable CSV input (42)