Runs the job.
First the job is locked. Then
*setup() is called, and the
current working directory is set to the job path, that is, any script
or functions calls are evaluated within the job directory.
Then the handle method
onStart() followed by
evaluated with this object as the first argument.
If an error occurs while evaluating these, it is caught and
onError() is evaluated.
Similar, if an interrupt, that is Ctrl-C (
SIGINT), occurs it is
onInterrupt() is evaluated.
Finally, handle method
onFinally() is (always) evaluated.
Errors or interrupts occuring while evaluating this latter method, will
Note also, that if errors or additional interrupts occurs while
onError() these will
not be caught. This can be an issue if for instance the user
holds down Ctrl-C. Unfortunately, there is no solution to the problem
at the moment .
TRUE if job finished successfully, otherwise
Henrik Bengtsson (http://www.braju.com/R/)
 H. Bengtsson, Exception handling in R, 2004. http://www.maths.lth.se/help/R/
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