Clean up unnecessary use of <numeric>.

And document what it is used for where needed.

doc/snippets/MathAlgorithms.cpp

@@ -24,7 +24,7 @@
     DEALINGS IN THE SOFTWARE.
 */
 
-#include <numeric>
+#include <numeric> /* std::accumulate() */
 #include <vector>
 #include <Corrade/Containers/ArrayView.h>
 

doc/snippets/Shaders-gl.cpp

@@ -24,7 +24,7 @@
     DEALINGS IN THE SOFTWARE.
 */
 
-#include <numeric>
+#include <numeric> /* std::iota() */
 #include <Corrade/Containers/Array.h>
 #include <Corrade/Containers/ArrayViewStl.h>
 #include <Corrade/Containers/Iterable.h>

src/Magnum/DebugTools/Profiler.cpp

@@ -29,7 +29,7 @@
 #include "Profiler.h"
 
 #include <algorithm> /* std::sort() */
-#include <numeric>
+#include <numeric> /* std::iota() */
 #include <Corrade/Utility/Assert.h>
 #include <Corrade/Utility/Debug.h>
 #include <Corrade/Utility/DebugStl.h>

src/Magnum/DebugTools/Test/CompareImageTest.cpp

@@ -25,7 +25,6 @@
 */
 
 #include <sstream>
-#include <numeric>
 #include <Corrade/Containers/Array.h>
 #include <Corrade/Containers/StridedArrayView.h>
 #include <Corrade/Containers/Optional.h>

src/Magnum/Math/Algorithms/Test/KahanSumTest.cpp

@@ -24,7 +24,7 @@
     DEALINGS IN THE SOFTWARE.
 */
 
-#include <numeric>
+#include <numeric> /* std::accumulate() */
 #include <Corrade/Containers/Array.h>
 #include <Corrade/TestSuite/Tester.h>
 

src/Magnum/MeshTools/Combine.cpp

@@ -26,7 +26,6 @@
 
 #include "Combine.h"
 
-#include <numeric>
 #include <Corrade/Containers/Iterable.h>
 #include <Corrade/Utility/Algorithms.h>
 

src/Magnum/MeshTools/RemoveDuplicates.cpp

@@ -28,7 +28,6 @@
 
 #include <cstring>
 #include <limits>
-#include <numeric>
 #include <unordered_map>
 #include <Corrade/Containers/Array.h>
 #include <Corrade/Containers/Pair.h>

src/Magnum/Shaders/Test/MeshVisualizerGLTest.cpp

@@ -25,7 +25,7 @@
     DEALINGS IN THE SOFTWARE.
 */
 
-#include <numeric>
+#include <numeric> /* std::iota() */
 #include <sstream>
 #include <Corrade/Containers/ArrayViewStl.h>
 #include <Corrade/Containers/Pair.h>