improvements to TIGER import: progress dialog, create nodes
improvements to TIGER import: progress dialog, create nodes

nakijun/vtp,nakijun/vtp,seanisom/vtp,seanisom/vtp,nakijun/vtp,markraz/vtp,markraz/vtp,nakijun/vtp,markraz/vtp,nakijun/vtp,seanisom/vtp,markraz/vtp,seanisom/vtp,markraz/vtp,seanisom/vtp