 the two successive checkpoints.   Optional dot
starting the argument intructs tar to print dots instead of textual
checkpoints.

** The --totals option can be used with any tar operation (previous versions
understood it only with --create).  If an argument to this option is
given, it specifies the signal upon delivery of which the statistics
is to be printed.  Both forms of this option (with and without
argument) can be given to in a single invocation of tar.

* Bug fixes
** Detect attempts to update compressed archives.

