fix serious bug in outline tracer
fix serious bug in outline tracer

https://github.com/gina-alaska/dans-gdal-scripts/issues/7
For any raster whos width is not a multiple of the block size, the right hand side of the
image would be corrupted.

gina-alaska/dans-gdal-scripts,gina-alaska/dans-gdal-scripts,gina-alaska/dans-gdal-scripts