Stats - Update to use getNextTask() not readContechTask()
MemUse - Update backend to provide a listing of the address space used

Backend builds a map of the allocations, representing the heap.  This is
printed as well as a listing of how many times each range is accessed.
Event - Update eventlib to provide stats about the raw event trace

It, in conjunction with ct_file, is counting how many '0' and '-1' bytes
are observed in the trace.  These bytes are expected to be the most common
and could lend themselves to a simple compression of the trace before writing.