@Override
	public String toString() {
		return getClass().getSimpleName() + "[\n\tvertex points=" + vertexPoints +
			"\n\tedge points=" + edgePoints + "]";
	}
Adds in the vertices and edges from another GridLocationMap with each point in the other
grid map shifted by the given row and column amounts.
@param other the other GridLocationMap to add to this one.
@param rowShift the amount to shift the rows in the grid points from the other grid before
adding them to this grid
@param colShift the amount to shift the columns in the grid points from the other grid before
adding them to this grid
Ghidra/Framework/Graph/src/main/java/ghidra/graph/viewer/layout/GridLocationMap.java