STANBOL-1128: Addition of UnitTest for the Engine. The current Tests only validate that Enhancements written by the Engine do confirm with the Stanbol EnhancementStructure. Assertions for expected resutls are still a TODO; Moved initialisation logic from the FstLinkingEngineComponent over to IndexConfiguration (as those things are also required for Unit Testing). Changed some internal APIs for clarity. The directory used to store FST models is now configureable. Improved TRACE level loggings

git-svn-id: https://svn.apache.org/repos/asf/stanbol/trunk@1526402 13f79535-47bb-0310-9956-ffa450edef68