more questions about dump/restore for the IRIS

[Steve Dempsey]

1. This version of 'dump' recognizes the letters 'b' and 'c' as part of the
   key argument, but these are not documented.  I'm probably safe in assuming
   that 'b' is used to specify blocksize, but what does 'c' do?

2. The README file indicates that the 'e' key causes directories to be dumped
   in EFS format, while the comments at the beginning of the dump.8 file
   say that 'e' dumps directories in BSD format.  Which way is it?

3. Is source available?
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