Add --fuzz, --real, --user to timing scripts

- Add a `--fuzz` option to `make-both-single-timing-files.py`

  Passing `--fuzz=N` allows differences in character locations of up to
  `N` characters when matching lines in per-line timing diffs.

  The corresponding variable for `coq_makefile` is `TIMING_FUZZ=N`.

  See also the discussion at
  https://github.com/coq/coq/pull/11076#pullrequestreview-324791139

- Allow passing `--real` to per-file timing scripts and `--user` to
  per-line timing script.

  This allows easily comparing real times instead of user ones (or vice
  versa).

- Support `TIMING_SORT_BY` and `TIMING_FUZZ` in Coq's own build

- We also now use argparse rather than a hand-rolled argument parser;
  there were getting to be too many combinations of options.

- Fix the ordering of columns in Coq's build system; this is the
  equivalent of #8167 for Coq's build system.

Fixes #11301
Supersedes / closes #11022
Supersedes / closes #11230

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