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Implements #40002.

We should include an error_code column in the CSV output, regardless
of whether data contains measurements with an error code or not.
Everything else is just too confusing to whoever processes these
files.

Fixes #40004.

Most parts of these files, or at least the important parts, are now
contained in README.md.

Still part of #40001.

This commit attempts to make README.md the primary, comprehensive
documentation for OnionPerf. There will be more documentation on the
wiki for things that change faster than we want to update a file in
Git or that are too specific for most users. But this README.md is
supposed to cover 90% of the questions that new users would have.

Implements #40001.

This really serves as test commit to try out whether mirroring to
GitLab works as expected.

Implements #33257.

The switch tells OnionPerf to prepend yesterday's date to the analysis
output file.  This new switch is mutually exclusive with --date-filter.

This fixes <https://bugs.torproject.org/29369>.

While touching this code:
 - make sure that the index.xml file itself is not contained and
 - fix the encoding issue introduced by the Python 3 upgrade.

Fixes #29365.

Signed-off-by: Philipp Winter <phw@nymity.ch>

One can enable single onion services by passing the --single-onion flag
to OnionPerf's measure mode.

Spotted by phw, part of #29370.

Right now, it's possible to specify both -o and -i at the same time,
which doesn't make any sense.

Also, it's rather non-intuitive that both argument defaults are True
and that setting either of them changes their value to False.

This patch fixes both issues above.

Fixes #34316.

Fixes #34261.