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Changes in version 3.1

- Ignore directories named "supervise" in multipipe.

- Added "teepipe" program.

- Modified build with SPAC.
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Changes in version 3.0

- Added a new program, "spipe", which supervises a pipeline of commands.

- Added a new program, "multipipe", which supervises a set of processes
  similar to svscan, but pipes a copy of stdin to each process.

- Added a new program, "tai64n2tai", which converts tai64n timestamps to
  old style tai timestamps, for use with qmail-analog.

- Added a new program, "tai2tai64n", which converts old style tai
  timestamps to tai64n format, just for completeness.

- Added an option for "multitail" to seek to the end of the first file
  before writing any output.
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