Fix the 27 features

After I had tested all paramaters of C4.5, I could confirm the 27 features for my ACE CR task.

There was a bug in c4.5R8, that the atof() function in C4.5.c could not change data into float. After changing atof() to atoi(), the program could identify the option of cutoff.

So I could do the next taskof consulting new case.