PICout improvement:

* renamed private members for more clear code
 * registerExternalBufferID() method to obtain unique ID for withExternalBuffer()
 * PICoutManipulators::PICoutStdStream enum for select stream (stdout or stderr)
 * Constructors now accept optional stream
 * piCerr and piCerrObj macros

PIDir::temporary() moved to "mkdtemp"

PILog:
 * now 4 levels
 * you can set max level
 * Error writes to piCerr

libs/main/containers/pimap.h

@@ -355,7 +355,7 @@ public:
 	inline PIMap<Key, T> & operator<<(const PIMap<Key, T> & other) {
 #ifndef NDEBUG
 		if (&other == this) {
-			printf("error with PIMap<%s, %s>::<<\n", __PIP_TYPENAME__(Key), __PIP_TYPENAME__(T));
+			fprintf(stderr, "error with PIMap<%s, %s>::<<\n", __PIP_TYPENAME__(Key), __PIP_TYPENAME__(T));
 		}
 #endif
 		assert(&other != this);