improved VF read/write to omit unused species and output more logging
improved VF read/write to omit unused species and output more logging

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