when request are made.

Closes #152

Closes #148

so that the ratio is calculated with measurments within a date period.

Closes #144

remove also `seealso` directive from the links and fix format in a
`note`.

missing due to .gitignore

and document how to add them.

Closes #147.

chg: bridge: Move bridge_ratio_threshold into the root of the json

See merge request tpo/network-health/onbasca!60

The bridge_results list in the response json now contains only bridge
results.

and fix the errors detected by the tools.

Closes #145

In the deploy example:
- Rename directory and install scripts
- Change systemd unit to be run by non root user
- Change default user name to `onbasca` instead of `onbrisca`
- Include start and stop scripts that can be run by non root user
- Fix the packages to install
- Modify gunincorn unit to listen in a port instead of a unix socket,
  so that there's no need for nginx
- Remove nginx and TLS certificate configuration
- Include local.py example
In the code:
- include missing packages in setup.cfg
- Remove django configuration for HTTPS with production settings
In the docs:
- point to the example directory deploy scripts
- Fix packages to install
- Clarify the steps (hopefully)

Closes #142

Closes #141

when calculating bridges' ratio. In the same way this is done when
calculation relays' ratio.

Also:
- Add fields to store the means and ratios
- Move out calculation of network means out of the bridge ratio
  calculation to stop doing it for every relay
- In case the scanner was cancelled before the latest consensus stored
  the bridge ratio threashold, use the the default in case this is None

Closes #139

to pass `black` checks in its new version 23.1.0 (last version was
22.12.0)

because TimeoutError doesn't have message.

what can happen when onbrisca first starts.

instead of adding all known bridges to the queue to measure.
Also:
- get tor bridge configuration before setting it, in order to do not
  set duplicated bridges
- when there's no progress measuring bridges, measure them again
- queue/measure bridges in smaller subsets to give time to the
  descriptors to arrive
- order the bridges to measure by those which doesn't have measurements
  first
- Create Bridge new field `_last_measured` to stop having to calculate
  it
- Remove the code in `obtain_relays` about not getting last consensus
  when the last one was obtained less than 1h ago, what it's useful
  developing, but doesn't follow the same path and complicate the
  logic when getting the bridge descriptors

Closes #138

Partly closes #138

Closes #136

Closes #131

to limit the set of relays that get to see each bridge (mitigation
against technique 2 from
https://research.torproject.org/techreports/ten-ways-discover-tor-bridges-2011-10-31.pdf)

start the project as development

also added test.

cause it is not compatible with Django 4.

removed in tox 4.0.0rc4.
https://tox.wiki/en/latest/changelog.html#deprecations-and-removals-4-0-0rc4

Closes #130