Added checkStatus test cases.  Added updateFGrid test cases.  Started work on getStats test cases.  Found a bug where the delta value is set to inf, and the program throws an error (using a value of size zero), which occurs when only a single user specified point is provided (numSensors and projectedSensors are set to 0).  This is related to the sensorMat variable, and the errors are caused by a 1:ns statement where ns is null.