IMRU single process standalone code

IMRUMultiCore runs Elastic-IMRU in a single process without using Hyracks. Elastic-IMRU only
needs a sendFrameToNode function to work. IMRUMultiCore simulates Elastic IMRU with precisely
controlled (simulated) network speed. It also allows to run IMRU Job on many-core system
without causing "too many opened files" exception.