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Limit number of jobs per node based on the available disk size

Problem: Jobs in a task are known to be very disk hungry - how to ensure that only one job of its kind ends up on a node?

Solution: make the job request 51% of a node's space

Request_disk = ifThenElse(isUndefined(TARGET.TotalDisk), 10485760, round(TARGET.TotalDisk * 0.51)

so that a second job's wish cannot be fulfilled by a node after accepting a first one.

Suggested by Michael Pelletier based on partitional jobs by Brian Bockelman

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