Update for HTML5 part1

What's Changed

Functional: nothing

Full Changelog: https://github.com/ABCD-DEVCOM/ABCD/compare/v3.1.0...v3.1.1

Details

The current generated HTML has obsolete tags/attributes, unclosed tags and many more (small errors). Many of these inconsistencies are hidden/masked/solved by modern browsers so the user is not aware of anomalies. But this is a ticking bomb, so the target is more robust code in HTML5.

Tool: Markup Validation Service (https://validator.w3.org/) Planning: Several code upgrades will be necessary and, at a certain moment also a rewrite of existing users defined reports/worksheets.

Actions by database administrator

The upgrade of the code can be done with the upgrade manager