Potential spiped 1.6.0 release -- please test

[Colin Percival <cperciva@tarsnap.com>]

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Hi spiped users,

I've just uploaded a tarball which may be (modulo version number update)
spiped 1.6.0.  Please test this -- even if all you have time to do is check
that it compiles on your platform, that's better than nothing, but running
'make all test' and/or testing with live usage would be much better.

You can download the spiped code at
  https://www.tarsnap.com/spiped/spiped-1.5.99.tgz
and the tarball has SHA256 hash
  5621013cdfb0e8aaf1d8e2d3c637b8f54f0ef059b1700645dce87532b70ce2d9
.  You can also see the tree from which I rolled this almost-release at
https://github.com/Tarsnap/spiped if you find it useful to crawl through
VCS history.

Significant changes since 1.5.0:
* The limit of 500 connections to the spiped -n flag has been removed.
* spiped now performs a graceful shutdown on SIGTERM.
* The -k option now accepts "-" as a synonym for standard input.
* A new -v option prints the version number of spipe and spiped.

There are also a variety of less visible changes: Performance improvements in
the SHA256 routines, a workaround for a docker signal-handling bug, minor bug
and compiler warning fixes, the addition of a test suite, and some minor code
reorganization.

Assuming nobody finds any problems (or the problems are things I can fix
quickly and easily) I'll roll the official spiped 1.6.0 release a week from
now.  As always, Tarsnap bug bounties apply to issues found in spiped.

- -- 
Colin Percival
Security Officer Emeritus, FreeBSD | The power to serve
Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid
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