Zdaemon

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- Fixed: programs started with zdaemon couldn't, themselves, invoke
zdaemon.

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Fail :(

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- Fixed:

The change in 2.0.6 to set a user's supplemental groups broke common
configurations in which the effective user was set via ``su`` or
``sudo -u`` prior to invoking zdaemon.

Now, zdaemon doesn't set groups or the effective user if the
effective user is already set to the configured user.

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- Added an option, ``start-test-program`` to supply a test command to
test whether the program managed by zdaemon is up and operational,
rather than just running. When starting a program, the start
command doesn't return until the test passes. You could, for
example, use this to wait until a web server is actually accepting
connections.

- Added a ``start-timeout`` option to error if a program takes too long to
start. This is especially useful in combination with the
``start-test-program`` option.

- Added an option, stop-timeout, to control how long to wait
for a graceful shutdown.

Previously, this was controlled by backoff-limit, which didn't make
much sense.

- Several undocumented, untested, and presumably unused features were removed.

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- Fixed: When the ``user`` option was used to run as a particular
user, supplemental groups weren't set to the user's supplemental
groups.

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(Accidental release. Please ignore.)