Merge branch 'master' into add_force_site_option

Author: KA7E

libs/libvtrutil/src/vtr_assert.cpp

@@ -16,6 +16,8 @@ void handle_assert(const char* expr, const char* file, unsigned int line, const
         fprintf(stderr, " (%s)", msg);
     }
     fprintf(stderr, ".\n");
+    fflush(stdout);
+    fflush(stderr);
     std::abort();
 }