- * makes a set of 'Coherent Files' list (coherent : same Serie UID)
- * It allows to sort any of the Coherent File list on the image position
+ * makes a set of 'Coherent Files' lists (coherent : same SerieUID)
+ * It allows :
+ * - to sort any of the Coherent File list on the image position.
+ * - to split any of the Single SerieUID Filesets (better use this name than
+ * 'Coherent File List' : it's NOT a std::list, files are NOT coherent ...)
+ * into several XCoherent Filesets
+ * XCoherent stands for 'Extra Coherent' (same orientation, or same position)