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*******                            Signals                              *******
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The WIT tools will handle the following signals:

 INT or TERM

    If catched first time the tool will finish after current job.
    If catched second time the tool will finish immediately with cleanup.
    If catched third time the tool will finish immediately without cleanup.

 USR1, USR2

    USR1 will decrease and USR2 increase the verbose level.
    The effect is delayed until beginning the next job.