[html generation] even when doctype without extension are asked, we should define the xmlns:cubicweb attribute to avoid html validation error during tests (break tests with new calendar view in default branch since it demote to html)

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include *.py

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include */*.py

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recursive-include data *.gif *.png *.ico *.css *.js

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recursive-include i18n *.po

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recursive-include wdoc *