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Not sure if it works correctly for the show() method.

For memset when throughput is measured. Works well for bandwidth,
probably wrong for duration.

Also add a basic program to compare the behaviours when measuring
bandwidth or throughput and a Python script to generate a Paje file
from the output.

And thus remove the simple heuristic: consider only the first 20 lines as header.

Instead of relying on the interleave flag of hwloc.