Merge branch 'issue50' into develop
Another Python 3 fix for simulating bias.
Write file containing accumulated per-run resource usage.

Only for quantification commands at the moment (i.e. not prequantification
yet). n.b. code untested yet.
Merge branch 'develop' into issue50
Plot time and memory usage for quantification step.

Not tested yet.
Add placeholder func for plotting prequant usage.
Make collection of resource usage stats optional.

e.g. for case where /usr/bin/time is not available.