9x9 grid

Signed-off-by: Nicolas Morey-Chaisemartin <nmorey@kalray.eu>
Use 3^ values

Signed-off-by: Nicolas Morey-Chaisemartin <nmorey@kalray.eu>
Compute next_next cell

Signed-off-by: Nicolas Morey-Chaisemartin <nmorey@kalray.eu>
Fix scores and 3 tile merge

Signed-off-by: Nicolas Morey-Chaisemartin <nmorey@kalray.eu>