Improved compiler flags for windows build.

SConstruct

@@ -11,7 +11,7 @@ elif sys.platform == 'win32':
     python_include = [sysconfig.get_python_inc()]
     python_libpath = [sysconfig.get_python_lib(1, 1) + '/../libs']
     python_lib = ['python24']
-    cppflags = '/EHsc'
+    cppflags = '/EHsc /O2 /ML /GS /Zi /TP'
 else:
     print "platform %s not supported"%sys.platform