Added "Delete memory" action, so the database can be easily deleted from the interface.
Added "Delete memory" action, so the database can be easily deleted from the interface.

git-svn-id: 5c3bb4a0fea81dff653294223dbc7ab7b926c710@34 f169173b-cf89-36c8-b27e-44dbe73f0c83

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