+ added alternative PID controller from http://www.multiwii.com/forum/viewtopic.php?f=8&t=3671

+ this is a per-profile setting, and PIDs CHANGE from default multiwii ones. check the above forum post for PID examples. set pid_controller = 0 for default multiwii, or 1 for new one.
= went back to clearing clibuffer after each command


git-svn-id: https://afrodevices.googlecode.com/svn/trunk/baseflight@341 7c89a4a9-59b9-e629-4cfe-3a2d53b20e61

src/board.h

@@ -75,6 +75,7 @@ typedef void (* sensorReadFuncPtr)(int16_t *data);          // sensor read and a
 typedef void (* baroCalculateFuncPtr)(int32_t *pressure, int32_t *temperature);             // baro calculation (filled params are pressure and temperature)
 typedef void (* uartReceiveCallbackPtr)(uint16_t data);     // used by uart2 driver to return frames to app
 typedef uint16_t (* rcReadRawDataPtr)(uint8_t chan);        // used by receiver driver to return channel data
+typedef void (* pidControllerFuncPtr)(void);                // pid controller function prototype
 
 typedef struct sensor_t
 {