Updated MSKCC cBio Cluster User Guide (markdown)
Updated IP address of head node.
Added note about expected service restoration date.
Updated IP address of cluster head to reflect DNS naming fiasco.
Updated name from sd.cbio to hpc.cbio
Added note to use the GitHub issue tracker.
Added note to raise an issue in the GitHub issue tracker first for any problems.
Edited section on interactive jobs to correct some mistakes.
Added warning not to run memory or CPU-intensive jobs on the head node.
Added note about /cbio/xxlab/projects/collab/
Added note about killing jobs.
Added notes on emergency intervention by Gunnar and John.
Added another warning about not using /tmp.
Added note on who to email for problems with the storage subsystem.
Added clarification of who to email for support.
Added bit about -q active for interactive jobs