routing: fix default argument mutability.

repositories: added option to archive repositories instead of deleting them. - closes #5493

repository: add check preventing of removal of repo with attached pull requests. - fixes #5493

users: use new session store for temporary settings for users. - use for clone url type selection - use for diffs mode

users: in case of multiple personal groups, return the first instead of an error. - backward compat fix from previous error we had

users: when deleting users ensure we also clear personal flag so we don't have multiple personal groups for super-admin who inherits the detached objects.

users: ensure get_first_superadmin actually gets the 1st created super-admin.

caches: show full paths for super-admin, hide paths for regular users for security.

diffs: small UI fixes

diffs: don't use highlite on the new ops lines