we no longer provide mpiP or Intel MPI
updated format to match Gordon User Guide
moved "Allocations" section to trestles_jobs.md; updated references to mpi modules to reflect new _ib suffix
updated format to match Gordon's gordon_running.md
made samples more consistent in nomenclature and added explicit examples
updated to match Gordon's gordon_storage.md
removed references to passive.sdsc.edu since Trestles now supports XSEDE auth; updated "more info" links to point to XSEDE