Delete Transpose

This seems to be working but need much more sophisticated work since it
gets really tricky with pointers and the incoming and outgoing Vertices
of each Vertex. I implemented it for Kosaraju’s Strongly Connected
Components but it turns out that I can just import the initial JSON
file in reverse way to construct a transpose graph. And this seems to
work fine for now, although Kosaraju algorithm implementation itself is
not stable for now.
Change the method name CopyPt -> CopySeqPt
Update CopyGraph

But CopyGraph is rarely used and we need to be more careful about the
pointers. Good for now unless we need to add or remove Vertices and
Edges after constructing the graphs.