Added deserialization time and script to parse all logs.

Also removed parsing of FETCH_INFOS, which are no longer included
in the log output, and fixed a bug with the way straggler times
are calculated.
Added no-straggler waterfall and logging of sim vs actual time.
Make waterfall for simulated case
Improved straggler calculations.

Added the straggler mitigation calculations that calculate the runtime
assuming that all tasks progress as the median progress rate,  and assuming
that all tasks have the median runtime for the stage. Also removed now-unused
code.