benchmarks should use argparse, not an external dependency like click

[FabioLuporini]

and this is what you can use for so called "choice" parameters : http://click.pocoo.org/5/options/#basic-value-options

I thought about this when I saw the option --noazimuth in the TTI example

potentially work for the UROP

[mloubout]

Not sure why this is better

[FabioLuporini]

it's more powerful and it would make it straightforward to reuse stuff across different examples (eg, isotropic and tti share lots of options)

benchmark.py also uses CLI, and it's good practice to have homogeneous code

[georgebisbas]

Should I incoroporate this in #1257 ?

[mloubout]

From issues that popped up with ltest click version, the opposite may have to be considered for future stability and replacing back click options by arg_parse. See #1832

[FabioLuporini]

In retrospect, I agree

[FabioLuporini]

updating title to reflect