Loads additional data on migration control operations, df (fishway) dc (counting device).
this method creates additional classes in envir_stacomi for later use in plot (operations, DF operation, DC operation). So unlike in most report classes where the charge method is only used by the graphical interface, it is necessary to run charge for report_mig.
# S4 method for report_mig charge(object, silent = FALSE)
An object of class
Should the program be returning messages
An object of class report_mig-class with slots filled by user choice