PIP_DEBUG, PIVector sort and doc

libs/main/core/pibase.h

@@ -38,7 +38,7 @@
 #include "piplatform.h"
 #include "pip_export.h"
 #include "pip_defs.h"
-#include "string.h"
+#include <string.h>
 
 //! \~english
 //! Meta-information section for any entity.
@@ -246,11 +246,6 @@
    extern char ** environ;
 #endif
 
-#ifdef NDEBUG
-#  undef NDEBUG
-#else
-#  define USE_DEBUG
-#endif
 #ifndef assert
 #  define assert(x)
 #  define assertm(exp, msg)