Add more mip levels set to fixed sizes
Disable MIPMAP_5 for now to avoid crashing
Reenable MIPMAP_5 and set MIPF to MIP3 size
Remove thumbnail_width/height settings
lighttable: use same border settings as darkroom mode. default to 20, to show dropshadow.

border of 0 works, but oddly cuts off the shadow around the image in lighttable mode.