1. study displacement on progressive blends of 2 images
     2. exhaustive ED kernel optimisation using standard HVS gaussian distance
     3. exhaustive ED kernel optimisation using off-center gaussian distance


git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/research@2274 92316355-f0b4-4df1-b90c-862c8a59935f

well as the associated C source code. Both will require huge cleanup for a
    final release.


git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/research@2273 92316355-f0b4-4df1-b90c-862c8a59935f