[doc] command output style has changed

[doc] always put file name for code example and uses :file:`path` syntax everywhere

[doc] explicitely give the local server url to make this step more obvious

[doc] start the server in debug mode, it's easier during learning

[doc] recommend sqlite during tutorial because it's simplier to use

[doc] add a link to every cube documentation page

[doc] make this step more obvious

[doc] move to latest CW version for cube creation

[doc] missng import for i18n in example

[doc] unused import in example

[doc] output has changed

[doc] blanks spaces to allow example to breath and be more lisible

[doc] default tests template has changed

[doc] default generated filename as changed

[doc] rst syntax bug, blank line needed before item list

[doc] add link to cubes contribution document

[doc] link to current documentation, not old cubicweb.org doc

[doc] translate french to english

[doc] typo, 'CW' doesn't exist in the example

[doc] always indicate the file in which the code should be put

[doc] respect pep8 in code examples

[doc] serie a small improvments

[doc] typo, the field is "name" not "title"

[doc] fix, command "create" is missing base cube

[doc] improve blog tutorial first steps and explain common errors

[doc] new behavior in virtualenv since 3.26

[skeleton] use python3 flake8 In tox "flake8" environment, use python 3 virtualenv, so we can check for python3 incompatible syntax.

[skeleton] drop whitelist_externals for flake8 whitelist_externals makes sense when used with sitepackages=true. In this case it will always rely on $VIRTUAL_ENV/bin/flake8 so, the whitelist_externals has no effect.

Fix flake8 issues since release 3.6.0 Flake8 had a new release which raise new issues, namely: W504: line break after binary operator F841: local variable 'ex' is assigned to but never used W605: invalid escape sequence F821: undefined name 'buffer' (noqa seems the only way to avoid this false positive) Also pin flake8>=3.6 in our tests and make explicit that we use python3 to run flake8 tests.

Fix typo in RDFS URI

[server] Fixed issue with the adapters cache of a cloned EditedEntity The adapters' cache of the entity within an EditedEntity used to be copied along the entity itself during a cloning operation of the EditedEntity. This raises an issue when the adapters' cache is not empty and contains cached values linking to transaction-specific data (or the transaction itself). This prevents the clone EditedEntity being used in a transaction outside the one that created it. This change resets the adapters' cache of the new copy so that no cached value remain. The new copy can then be used in a new transaction afterwards.

[py37] `async` is now a reserved keyword