[sizing] fixes and enhancements

[stas00]

This PR:

1. fixes:

  File "/data/stas/benchmarks/cookbook/benchmarks/sizing/mm_flops.py", line 47, in <module>
    with open(args.output_file, 'w') as sys.stdout:
FileNotFoundError: [Errno 2] No such file or directory: '../results/mm.out'

now you can launch the script from any relative dir and it'd just work.

2. adds dependencies needed to run the scripts

3. adds --verbose (default On) and a Tee class to send print to both log file and stdout

4. adds a useful note+link about https://gist.github.com/malfet/6a17156d7f5663b8b12054a1beff3fe1 that @Quentin-Anthony shared with me.

---

Questions:

1. results probably shouldn't be under git

[CLAassistant]

All committers have signed the CLA.

[Quentin-Anthony]

Thank you!!