Fixed a bug in summary_nfi and biomass_nfi where functions were not working when largetree_area = FALSE.
Fixed a filtering bug in filter_nfi where plots with the same subplot name in different cycles were not properly filtered at sublayers - resolved by implementing simultaneous filtering using both subplot and cycle.
Improvements
read_nfi: Added support for additional list.files() arguments (e.g., pattern, recursive) to provide more flexibility in file selection.
summary_nfi, iv_nfi, diversity_nfi, biomass_nfi, cwd_biomass_nfi: Added continuousplot parameter to filter for plots with measurements across all NFI cycles.
tsvis_nfi: Added layout control parameters (ncol, nrow) for customizing plot visualization and top parameter for selecting number of top species to display. *nfi_col: Renamed from col_name to provide a more descriptive name
