removed AP_PID test, deprecated and forgotten

libraries/AP_PID/examples/AP_pid/AP_pid.pde

@@ -1,52 +0,0 @@
-/*
- *       Example of PID library.
- *       2010 Code by Jason Short. DIYDrones.com
- */
-
-#include <Arduino_Mega_ISR_Registry.h>
-#include <FastSerial.h>
-#include <AP_Common.h>
-#include <AP_Param.h>
-#include <APM_RC.h> // ArduPilot RC Library
-#include <AP_PID.h> // ArduPilot Mega RC Library
-
-long radio_in;
-long radio_trim;
-
-Arduino_Mega_ISR_Registry isr_registry;
-AP_PID pid;
-APM_RC_APM1 APM_RC;
-
-void setup()
-{
-    Serial.begin(115200);
-    Serial.println("ArduPilot Mega AP_PID library test");
-
-    isr_registry.init();
-    APM_RC.Init(&isr_registry);          // APM Radio initialization
-
-    delay(1000);
-    //rc.trim();
-    radio_trim = APM_RC.InputCh(0);
-
-    pid.kP(1);
-    pid.kI(0);
-    pid.kD(0.5);
-    pid.imax(50);
-    pid.kP(0);
-    pid.kI(0);
-    pid.kD(0);
-    pid.imax(0);
-    Serial.printf("P %f  I %f  D %f  imax %f\n", pid.kP(), pid.kI(), pid.kD(), pid.imax());
-}
-
-void loop()
-{
-    delay(20);
-    //rc.read_pwm();
-    long error              = APM_RC.InputCh(0) - radio_trim;
-    long control    = pid.get_pid(error, 20, 1);
-
-    Serial.print("control: ");
-    Serial.println(control,DEC);
-}