- generate smaller thumbnail mosaics
- process more images (1 out of 15 instead of 20)
- try to rule out more similar images
- cope with streams that do not advertise their picture size in the headers
git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@3351 92316355-f0b4-4df1-b90c-862c8a59935f