DatabaseViewer: disabling SIFT/SURF/g2o when not available
DatabaseViewer: disabling SIFT/SURF/g2o when not available

MASKOR/rtabmap,chen0510566/rtabmap,srmanikandasriram/rtabmap,srmanikandasriram/rtabmap,chen0510566/rtabmap,markusgrotz/rtabmap,srmanikandasriram/rtabmap,chen0510566/rtabmap,markusgrotz/rtabmap,MASKOR/rtabmap,MASKOR/rtabmap,markusgrotz/rtabmap