tested in windows and linux.
stock-config-files-handling #6079 o stock-config files handling on program load to preserve any user changes to config files (move to archive directory) and allow copy in of freshest version of shipped stock config files. o enhance stock-config menu to handle access to archive directories. - also extended to the 'radio/import from stock config' menu.
Additional note on stock configuration files: In order to prevent overwriting user-copy stock config files with shipped versions, CHIRP skips the copy of those files which already exist in the user-copy directory, leaving any new data in shipped versions in the shipped stock config directory. This function examines each pair (shipped vs user copy) and if different, moves the user-copy stock config to an archive directory, thereby permitting CHIRP to copy the newer shipped version to the user-copy directory. This new archive retains any user-modified data.