message: Bugfix indexing error in quest's vertex weld tests.
  Several tests had triangles that were indexing a vertex that did not exist.
  After fixing, valgrind no longer shows memory access errors.
  Thanks Arlie for noticing the problem.
diff: @@ -165,7 +165,7 @@ TEST( quest_vertex_weld, vertexAdjacentTrianglePair)
  EXPECT_EQ(6, mesh->getMeshNumberOfNodes());
  insertTriangle(mesh, 0, 1, 2);
  - insertTriangle(mesh, 4, 5, 6);
  + insertTriangle(mesh, 3, 4, 5);
  EXPECT_EQ(2, mesh->getMeshNumberOfCells());
  axom::quest::weldTriMeshVertices(&mesh, EPS);
  @@ -197,7 +197,7 @@ TEST( quest_vertex_weld, edgeAdjacentTrianglePair)
  EXPECT_EQ(6, mesh->getMeshNumberOfNodes());
  insertTriangle(mesh, 0, 1, 2);
  - insertTriangle(mesh, 4, 5, 6);
  + insertTriangle(mesh, 3, 4, 5);
  EXPECT_EQ(2, mesh->getMeshNumberOfCells());
  axom::quest::weldTriMeshVertices(&mesh, EPS);
  @@ -229,7 +229,7 @@ TEST( quest_vertex_weld, fuzzWeld)
  EXPECT_EQ(6, mesh->getMeshNumberOfNodes());
  insertTriangle(mesh, 0, 1, 2);
  - insertTriangle(mesh, 4, 5, 6);
  + insertTriangle(mesh, 3, 4, 5);
  EXPECT_EQ(2, mesh->getMeshNumberOfCells());
  const double eps = .1;
  @@ -260,7 +260,7 @@ TEST( quest_vertex_weld, disconnectedTrianglePair)
  EXPECT_EQ(6, mesh->getMeshNumberOfNodes());
  insertTriangle(mesh, 0, 1, 2);
  - insertTriangle(mesh, 4, 5, 6);
  + insertTriangle(mesh, 3, 4, 5);
  EXPECT_EQ(2, mesh->getMeshNumberOfCells());
  axom::quest::weldTriMeshVertices(&mesh, EPS);
  