Lime: Report calibration errors in GUI. Check LPF is reasonable for up/downconversion.

plugins/samplesource/fileinput/fileinputgui.h

@@ -77,6 +77,7 @@ private:
 	void displayTime();
 	void sendSettings();
     void updateSampleRateAndFrequency();
+    void checkLPF();
 	void configureFileName();
 	void updateWithAcquisition();
 	void updateWithStreamData();