Fixed bug with RawVolume always starting coordinates at (0,0,0).

Removed Filters.h/.inl
Added Summed Area Table support to LowPassFilter.
Added test for low pass filter.

tests/TestLowPassFilter.h

@@ -0,0 +1,37 @@
+/*******************************************************************************
+Copyright (c) 2010 Matt Williams
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+    1. The origin of this software must not be misrepresented; you must not
+    claim that you wrote the original software. If you use this software
+    in a product, an acknowledgment in the product documentation would be
+    appreciated but is not required.
+
+    2. Altered source versions must be plainly marked as such, and must not be
+    misrepresented as being the original software.
+
+    3. This notice may not be removed or altered from any source
+    distribution.
+*******************************************************************************/
+
+#ifndef __PolyVox_TestLowPassFilter_H__
+#define __PolyVox_TestLowPassFilter_H__
+
+#include <QObject>
+
+class TestLowPassFilter: public QObject
+{
+	Q_OBJECT
+	
+	private slots:
+		void testExecute();
+};
+
+#endif