Add MwLinksUpdateWithSQLStoreDBIntegrationTest

For reference, see [1] and #119.

[1] http://wikimedia.7.x6.nabble.com/SMW-no-longer-works-with-a-manual-LinksUpdate-call-td5020561.html

Change-Id: Icd9a925b44e62f06e472545b16ec8f71b941556b
Some tidy work

Change-Id: I38506ddeec9d5ea23ab98c33fb355e7bbbf1f573
Merge pull request #119 from SemanticMediaWiki/integration-tests

LinksUpdate and SMW 1.9