added support for Felkel roof geometry (from RJ)
added support for Felkel roof geometry (from RJ)

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