aqhome-tool: added some commands

- getFirstData
- getLastData
- getPeriodData

apps/aqhome-tool/utils.h

@@ -41,6 +41,8 @@ void Utils_PrintValue(const AQH_VALUE *value, int printHeader);
 
 AQH_DEVICE *Utils_DeviceFromArgs(GWEN_DB_NODE *dbArgs);
 
+uint64_t Utils_GetTimeStampFromString(const char *s);
+
 
 #endif