[MINOR] Remove exception in cast as IntArray

This commit removes the exception in cast as IntArray from DoubleArray.
We encounter an issue in this conversion for large numbers of double
values, that does not cast perfectly to the same double values when
casting the integer values back to doubles.

The script that reproduce the bug is:

```
k = ifdef($k, 5)
paq = ifdef($paq, 1)
X = round(rand(rows = 50, cols = 10, min=1, max=10))
y = X %*% rand(rows = ncol(X), cols = 1)
w = lm(X = X, y = y)
yhat = X %*% w
ress = slicefinder(X = X, e = abs(y - yhat), k = k, maxL = 0, minSup =
1, alpha = 1, selFeat = TRUE, verbose = TRUE)
print(toString(ress))
```

A subsequent commits add a test case that ensure this bug does not
happen again.

src/main/java/org/apache/sysds/runtime/frame/data/columns/DoubleArray.java

@@ -293,33 +293,24 @@ protected Array<Float> changeTypeFloat() {
 	@Override
 	protected Array<Integer> changeTypeInteger() {
 		int[] ret = new int[size()];
-		for(int i = 0; i < size(); i++) {
-			if(_data[i] != (int) _data[i])
-				throw new DMLRuntimeException("Unable to change to Integer from Double array because of value:" + _data[i]);
+		for(int i = 0; i < size(); i++)
 			ret[i] = (int) _data[i];
-		}
 		return new IntegerArray(ret);
 	}
 
 	@Override
 	protected Array<Long> changeTypeLong() {
 		long[] ret = new long[size()];
-		for(int i = 0; i < size(); i++) {
-			if(_data[i] != (long) _data[i])
-				throw new DMLRuntimeException("Unable to change to Long from Double array because of value:" + _data[i]);
+		for(int i = 0; i < size(); i++)
 			ret[i] = (long) _data[i];
-		}
 		return new LongArray(ret);
 	}
 
 	@Override
 	protected Array<Object> changeTypeHash64() {
 		long[] ret = new long[size()];
-		for(int i = 0; i < size(); i++) {
-			if(_data[i] != (long) _data[i])
-				throw new DMLRuntimeException("Unable to change to Long from Double array because of value:" + _data[i]);
+		for(int i = 0; i < size(); i++) 
 			ret[i] = (long) _data[i];
-		}
 		return new HashLongArray(ret);
 	}