Start release 1.6
Merge branch '1.5'
Merge branch '1.5'
Revert "Link to the version 1.5 of the CGXP docs"

This reverts commit 3b5b5809079ec10347ab106dfe903d4ddc088c02.
Add pep8-naming

Display flake8 versions

Upgrade code styles versions
Correct code style

Also replace `# flake8: noqa` by `# noqa`
Merge pull request #1103 from camptocamp/naming

Update code checkers, add maming, correct styles
Remove WFS GetFeature response truncating
Update validation patterns for MapServer 7.0
Add some Debian packages testing
Merge pull request #932 from camptocamp/remove-limit-featurecollection

Remove WFS GetFeature response truncating
Update database diagram