adding the second terminateur offset while isolating and openning an archive with external catalogue
modifying ver.set_ref_header_version to include in addition the second terminteur offset
adding a field in i_archive class to store the second_terminateur_offset
macro_tools_close_layers() added argument to return the second_terminator_offset
fixing bug when using external slice/version header with ciphered archive
fixing bug
updating documentation
Avoid reading first / last slice for archive format when using an isolated catalog