Intel compiler fails to build tests

[oelbert]

When building with the intel compiler if we try to use SERIALBOX_TESTING=ON cmake crashes at this line:

serialbox/test/CMakeLists.txt

Line 49 in 263183b

set_target_properties(${ARG_NAME} PROPERTIES COMPILE_FLAGS -warn all )

with an unexpexted number of arguments. I believe this is because the -warn all should be -Wall in the call to set_target_properties