don't need shiftgrid
Added warpimage.py example.
New warpimage.py example (really cool)
fixed affine inverse bug
include bbox info in ps files
fixed a bug in get_bbox
More informative error message for readshapefile
numerix_x_y transform will return nan rather than raise on bad transforms
added help file for diagnosing segfaults
removed redef of row var that vs6 complained about