LandDist: Calculates opportunity costs to insert a node
In bjhufstetler/LeapFrog: LeapFrog for TSP

Takes a tour and distance matrix and returns the tour length

1	LandDist(dMat, p, nodeCount, tour, jumpers, node)

`dMat`	A `n`x`n matrix` where first row is not column headers. Each cell represents the distance from the row index node to the column index node.
`p`	A `numeric` that tells the function how many jumpers are being considered
`nodeCount`	The `numeric` number of nodes in the problem instance
`tour`	A `numeric` vector with the order that the nodes in the coordMatrix are visited. Must be the same length as the coordMatrix
`jumpers`	An `integer vector` of the jumpers currently in the air
`node`	The `integer` specific jumper currently under consideration