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Refs: #53

Fix: #54

Fix: #47

Some security headers are added in searx conf since v0.18.0

Qwant search will be forbidden from some countries
https://www.numerama.com/tech/676925-qwant-ferme-lacces-a-son-moteur-de-recherche-dans-certains-pays.html

version 0.18.0

Fix: #57

Fix: #55

prepare release 0.18.0: update CHANGELOG.rst

Improve doc of the installation skripts

update AUTHORS.rst with new contributors

[doc] update developer quickstart guide

[Fix] Startpage

[remove] remove searchcode_doc and twitter

BTW: drop a trailing whitespace
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

related to:

- https://gist.github.com/dalf/60450e19b042bd39b9ce470c095d89b3#gistcomment-3263827
- https://github.com/searx/searx/issues/2013#issuecomment-647132313
- https://github.com/searx/searx/issues/2017#issuecomment-647700327Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

See https://github.com/searx/searx/issues/2369#issuecomment-740652878Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

[fix] command engine: SearchQuery.query is str not bytes

[enh] add raise_for_httperror

check HTTP response:
* detect some comme CAPTCHA challenge (no solving). In this case the engine is suspended for long a time.
* otherwise raise HTTPError as before

the check is done in poolrequests.py (was before in search.py).

update qwant, wikipedia, wikidata to use raise_for_httperror instead of raise_for_status

Fix mojeek