Folks,

Over the last few days I've bent the tz tape driver into something a
little more useful.  It now should handle variable block sizes on drives
that can handle them (which should result on much faster operation).
If there's anyone using the tape driver can you please check that it
still works (or works better!) and if there's any problems please file a
report with send-pr.

Thanks to Pierre Bergdolt for helping with testing.

Simon.