Addition of warnings 

In addition to blocking errorstes that exist in the normalization module, it is now possible to create warnings (using the same rules as for errors) on fields.

A warning functions in the same way as an error, but is not blocking: it can be ignored and does not prevent the user from completing the step.

Warnings are displayed separately for errors in the table and in the normalization form.

When a line is validated but still has warnings, it will remain in the"Lines to check" category. But by selecting it, the user can use either the "Validate" button at the top of the table, or the "Ignore warnings" button at the bottom of the form.