Fixed minor bugs in LABL and NCER formats.

Labl: Block size includes the "header".
Ncer: Tilesize is the result of 2^(5 + value) where the value
is only the first byte. The other data is unknown.
               Added properties with the unknown values to debug.
Added a warning to check if the number of blocks is invalid.

Found several damage NCER files with that. Now it doesn't 
make an exception. It seems the developpers really don't care
to follow the standard (hey!, copy the 3 of num blocks but do not generate
the LABL block) -.-'