Fix infinite UpdateJob

- Remove GLOBAL state from `SMWSQLStore3Writers::updateRedirects`
- Add `JobQueueDBIntegrationTest::testNoInfiniteUpdateJobsForCircularRedirect`
Fix 618

- Add `SMWQueryParser::isPagePropertyType`
- Add test for `[[Has subobject::<q>[[Area::891.85 kmÂ²]] OR [[Population::2234105||3517424]]</q>]]`
Merge pull request #625 from SemanticMediaWiki/queryparser-sobj-type

Fix #618 / Subobject subquery