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Add landmark point node to pose graph

`addPointLandmark(`

adds a landmark point node, based on the input position
`poseGraph`

,`measurement`

)`measurement`

that connects to the last pose node in the pose
graph. To add pose measurement nodes, see the `addRelativePose`

function.

`addPointLandmark(`

also specifies the information matrix as part of the edge constraint, which
represents the uncertainty of the landmark measurement.`poseGraph`

,`measurement`

,`infoMat`

)

`addPointLandmark(`

adds a new landmark point node and connects it to the pose node specified by
`poseGraph`

,`measurement`

,`infoMat`

,`poseNodeID`

)`poseNodeID`

.

`addPointLandmark(`

creates an edge by specifying a point measurement between existing nodes, specified
by `poseGraph`

,`measurement`

,`infoMat`

,`poseNodeID`

,`pointNodeID`

)`poseNodeID`

and `pointNodeID`

. If the node
pair already exists, the function appends the new measurement.