see #20455: Raise "Unclosed way - landuse" warnings to errors

- lower the severity for boundary=* ways to warning again

git-svn-id: https://josm.openstreetmap.de/svn/trunk@17491 0c6e7542-c601-0410-84e7-c038aed88b3b

fix #20222: Relation editor: Changes in member order are lost when up…

…dates are applied

- correct logic which decides what type of command is needed, regression from r17358

git-svn-id: https://josm.openstreetmap.de/svn/trunk@17401 0c6e7542-c601-0410-84e7-c038aed88b3b