Remove remaining wfGetDB from SMWSQLStore3Writers
Extends GenericLoremIpsum.xml
Add @group
Add SqlStoreWriterChangeTitleTest, SqlStoreWriterDataUpdateTest

- Mostly tests verifies the DB related changes
- Some functions rely on GLOBAL $smwgQEqualitySupport, this needs to be changed in a follow-up
- Property table hash computation or changes are not tested
- @group semantic-mediawiki-sqlstore does cover ~48% of the SMWSQLStore3Writers
Merge pull request #265 from SemanticMediaWiki/sqlstore-writer

Remove remaining wfGetDB from SMWSQLStore3Writers