[base] Partial implementation of task graph management class.
[base] Add task graph unit tests.
[engine] Remove problematic deletion line (investigation pending); do not dump task output to coordinator stdout.
[examples] Add bandwidth analysis task code for R2D2 trace analysis.
[examples] Make R2D2 analysis tasks runnable within Firmament jobs.
[examples] Ignore DAG1 packets; more output (notify about mass-mismatches, and track source at DAG1 endpoint).
[examples] Fix bug leading to infinite loop if match window > trace length.
[examples] Length zero means "all packets" for trace analysis.