Disable one warning (strict-overflow) which created problems with GCC 8

CMakeLists.txt

@@ -81,7 +81,7 @@ ENDIF("${IsSystemDir}" STREQUAL "-1")
 #########################################
 
 # Set standard build flags
-SET(COMPILER_FLAGS -pedantic -Wall -Wextra -Wcast-align -Wcast-qual -Wconversion -Wuseless-cast -Wctor-dtor-privacy -Wzero-as-null-pointer-constant -Wdisabled-optimization -Wformat=2 -Winit-self -Wlogical-op -Wmissing-declarations -Wmissing-include-dirs -Wnoexcept -Wold-style-cast -Woverloaded-virtual -Wredundant-decls -Wsign-conversion -Wsign-promo -Wstrict-null-sentinel -Wstrict-overflow=5 -Wswitch-default -Wundef -Werror -Wshadow -Wformat-security -Wdeprecated -fdiagnostics-color=auto -Wheader-hygiene)
+SET(COMPILER_FLAGS -pedantic -Wall -Wextra -Wcast-align -Wcast-qual -Wconversion -Wuseless-cast -Wctor-dtor-privacy -Wzero-as-null-pointer-constant -Wdisabled-optimization -Wformat=2 -Winit-self -Wlogical-op -Wmissing-declarations -Wmissing-include-dirs -Wnoexcept -Wold-style-cast -Woverloaded-virtual -Wredundant-decls -Wsign-conversion -Wsign-promo -Wstrict-null-sentinel -Wswitch-default -Wundef -Werror -Wshadow -Wformat-security -Wdeprecated -fdiagnostics-color=auto -Wheader-hygiene)
 
 # Require a C++14 compiler but do allow extensions
 SET(CMAKE_CXX_STANDARD 14)

src/modules/ClusteringSpatial/ClusteringSpatial.cpp

@@ -81,20 +81,25 @@ StatusCode ClusteringSpatial::run(std::shared_ptr<Clipboard> clipboard) {
         while(addedPixel) {
 
             addedPixel = false;
-            for(int row = (pixel->row() - 1); row <= (pixel->row() + 1); row++) {
+            for(int row = pixel->row() - 1; row <= pixel->row() + 1; row++) {
                 // If out of bounds for row
-                if(row < 0 || row >= nRows)
+                if(row < 0 || row >= nRows) {
                     continue;
-                for(int col = (pixel->column() - 1); col <= (pixel->column() + 1); col++) {
+                }
+
+                for(int col = pixel->column() - 1; col <= pixel->column() + 1; col++) {
                     // If out of bounds for column
-                    if(col < 0 || col >= nCols)
+                    if(col < 0 || col >= nCols) {
                         continue;
+                    }
 
                     // If no pixel in this position, or is already in a cluster, do nothing
-                    if(!hitmap[row][col])
+                    if(!hitmap[row][col]) {
                         continue;
-                    if(used[hitmap[row][col]])
+                    }
+                    if(used[hitmap[row][col]]) {
                         continue;
+                    }
 
                     // Otherwise add the pixel to the cluster and store it as a found
                     // neighbour