0.10 10 May 2011

        Added "retry" functionality for often called cronjobs that may exceed
        their allotted wallclock time occasionally.

0.09 13 May 2009

        Added "silent" option so that a script can indicate whether or not it
        wants to tell the world whether it saw a previous incarnation running.

0.08 25 March 2008

        Given up after almost a week getting the test to complete without
        errors.  Added two TODO sections: manual testing indicates that
        everything seems to work as it should, so I guess it must be some
        test-suite artefact causing problems.

        20 March 2008
        Added support for SKIP_SYS_RUNALONE environment variable to skip the
        functionality altogether.  After a feature request by Rick Jansen.
        Made the code a little more adhering to PBP.

0.07 15 November 2006

        Why did testing just go ok and wrong now?  Argh, must be too late.
        Fix for warning and test error.

0.06 15 November 2006

        Brought up to BPB standards.  Made the error message if no DATA handle
        found, hopefully more understandable.

0.05 11 June 2006

Added caveat of scripts being edited.

0.04 11 July 2005

Some pod fixes. Added link to Sys::RunAlways.

0.03 10 June 2005

Oops. Still one more race condition to fix in test-suite.

0.02 10 June 2005

Hopefully fixed problem with race conditions in the test-suite.

0.01 9 June 2005

First public version of Sys/RunAlone.pm.