fixed map bugfix (fist instead of first), new access functions for fixed maP

(first(), second()), some documentation, raw pool access read() call public
because call is necessary before using public serialize function.
maybe integrate read() call into serialize function?

parameters/HasParametersIF.h

@@ -46,7 +46,6 @@ public:
 	 * @param startAtIndex
 	 * @return
 	 */
-	// shouldnt startAtIndex be uint8?
 	virtual ReturnValue_t getParameter(uint8_t domainId, uint16_t parameterId,
 			ParameterWrapper *parameterWrapper,
 			const ParameterWrapper *newValues, uint16_t startAtIndex) = 0;