CLEREZZA-683: re-implementation of the Comparator for the indexed in-memory graph to support different Clerezza Resource implementation. The new comparator is about 100% solver for updates. For reads (e.g. the filter() method) there is no mesureable difference. See the according comment on the CLEREZZA-683 Issue for details.

git-svn-id: https://svn.apache.org/repos/asf/stanbol/trunk@1490574 13f79535-47bb-0310-9956-ffa450edef68