after milestone2 tag, switch back to O3 for further investigation and work

CMakeLists.txt

@@ -39,7 +39,7 @@ endif()
 # enable warnings and disallow non-standard language
 set(CMAKE_CXX_FLAGS "-Wall -pedantic -Wextra -Wno-ignored-qualifiers")
 set(CMAKE_CXX_FLAGS_DEBUG "-O0 -g")
-set(CMAKE_CXX_FLAGS_RELEASE "-O0") # should be -O3 but bug 118 prevents this right now
+set(CMAKE_CXX_FLAGS_RELEASE "-O3") 
 
 # clang produces a lot of unecessary warnings without this:
 add_compile_options("$<$<CXX_COMPILER_ID:Clang>:-Wno-nonportable-include-path>")