cracker: Use the kasiski module

There is now at least one method to break the key length.

Signed-off-by: Celelibi <celelibi@gmail.com>
unvigenere: Allow to not specify the key length

Now there is the kasiski module, there is no need to force the key
length to be given.

Signed-off-by: Celelibi <celelibi@gmail.com>
cracker: Allow to chose the kasiski minimum length

The user of this module can now chose any value for the minimum
length of the substring match for the kasiski method.

Signed-off-by: Celelibi <celelibi@gmail.com>
unvigenere: Bring the kasiski min length to user

Since the cracker module support configuration of the minimum length of
the substring match for the kasiski method, better show it to the
command line.

Signed-off-by: Celelibi <celelibi@gmail.com>
unvigenere: Show kasiski score table

Show the long table of matching scores for the kasiski method.

Signed-off-by: Celelibi <celelibi@gmail.com>