fixed curvature

...Sources/functions/accumulator/MaxCurvatureDifference.java

...ava/bdv/jogl/VolumeRenderer/utils/CurvatureContainer.java

...java/bdv/jogl/VolumeRenderer/utils/GradientContainer.java

.../java/bdv/jogl/VolumeRenderer/utils/HessianContainer.java

src/main/java/bdv/jogl/VolumeRenderer/utils/MatrixUtils.java

...n/java/bdv/jogl/VolumeRenderer/utils/VolumeDataUtils.java

...t/java/bdv/jogl/VolumeRenderer/tests/MatrixUtilsTest.java

...va/bdv/jogl/VolumeRenderer/tests/VolumeDataUtilsTest.java