Update CrackDetection.java

1) Code for calculating crack detection ratio and printing crack detection alarm added - see
if (  (  Math.abs(aodArea[1] - aodArea[0])  /  dMinArea  ) > dThreshold )  

2) magnitude [] [], aod_angleOut [] [] and some other local variables of run() method are moved to be fields of CrackDetection class 

3) Some unused variables and comments removed