A task to provide "nice-ness" to the current thread, and/or to
query the current value.
Examples:
<nice currentPriority="current.value" >
Set currentPriority to the current priority
<nice newPriority="10" >
Raise the priority of the build process (But not forked programs)
<nice currentPriority="old" newPriority="3" >
Lower the priority of the build process (But not forked programs), and save
the old value to the property old .
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