Update CrackDetection.java

1) magnitude [] [] array is now 2-dimensional (instead of 1-dimensional). 
magnitude = new double[2] [iData_Length];

2) Some comments are removed 

3) Crack detection analysis is now based on calculating area under the curve for 2 blades at a time

4) Still there is only 1 iteration of this thread. flock is added to provide synchronization with FFT thread but synchronization is working now incorrect so all its functionality is commented