Updated default parameter "RawDataKept" in database to true.
Fixed a bug of showing rejected loop closure image in GUI when RawDataKept=false and the loop closure id is not set (only highestHypothesisId when the loop is rejected).
git-svn-id: http://rtabmap.googlecode.com/svn/trunk/rtabmap@211 f169173b-cf89-36c8-b27e-44dbe73f0c83