BTW the upgrade was kind of a pain, as Semantic MediaWiki now really wants to be installed via composer, a PHP dependency management thing, which required removing/commenting out git/manually installed SMW, but it did all work, seeing spelled out at http://semantic-mediawiki.org/wiki/Help_talk:Installation#MW_1.22_and_SMW_1.9beta_install.2Fupgrade_... helped.