Unpack every pzz files present in _source_folder_ using the same directory. For each pzz a folder is created using the name of the pzz. If optional_dest_folder is specified we unpack all files in _optional_dest_folder_ instead of source_folder.
Pack every folder present in _source_folder_ using the same directory. For each folder a pzz file is created using the name of the pzz. If optional_dest_folder is specified we pack all folders in _optional_dest_folder_ instead of source_folder.
For example file **012C_cmn_data.dat** describe the 13th file off the pzz initialy compressed in a pzz named "cmn_data.pzz" and that has been uncompressed with the default format "dat". The names of unpacked files and the presence of empty unpacked files are important to keep informations relative to the initial pzz and ensure a correct pack.