Change default number of slots to 3 for picard jobs to reflect more closely actual observed usage and to avoid resource contention problems when running multiple JVMs on individual nodes.
Change default number of slots to 3 for picard jobs to reflect more closely
actual observed usage and to avoid resource contention problems when
running multiple JVMs on individual nodes.

AntonioJBT/CGATPipeline_core,CGATOxford/CGATPipelines,CGATOxford/CGATPipelines,CGATOxford/CGATPipelines,AntonioJBT/CGATPipeline_core,AntonioJBT/CGATPipeline_core,CGATOxford/CGATPipelines,AntonioJBT/CGATPipeline_core,CGATOxford/CGATPipelines