Modify populations in an already existing `IFC_data` object.
data_modify_regions(obj, regions, display_progress = TRUE, ...)an IFC_data object with regions modified.
an `IFC_data` object extracted by ExtractFromDAF(extract_features = TRUE) or ExtractFromXIF(extract_features = TRUE).
a list of region(s) to modify in 'obj'. Each element of this list will be coerced by buildRegion.
whether to display a progress bar. Default is TRUE.
Other arguments to be passed.
regions names should be present in names(obj$regions), otherwise an error will be raised.
Note that If you want to rename regions, you should do it by changing 'label' member,
e.g. regions[[1]]$label <- "bar" while names(regions[[1]]) is "foo" and "foo" is part of names(obj$regions).