point2dem: Robustness for t_projwin
Minor tweaks
point2dem: Add option to erode point cloud pixels
dem_mosaic: Add --weights-exponent option
dem_mosaic and doc: Minor tweaks
dem_mosaic: Blur the weights to increase smoothness
BlobIndexThreaded: Util to wipe big blobs
dem_mosaic: Option to fill in holes
point2dem: Swtich to grassfire for hole-filling works much better