first parameter of createERFilterNM1/createERFilterNM2 is now mandatory. changed the sample program to use the new prototypes

samples/cpp/erfilter.cpp

@@ -58,7 +58,7 @@ int  main(int argc, const char * argv[])
     double t = (double)getTickCount();
 
     // Build ER tree and filter with the 1st stage default classifier
-    Ptr<ERFilter> er_filter1 = createERFilterNM1();
+    Ptr<ERFilter> er_filter1 = createERFilterNM1(loadClassifierNM1("trained_classifierNM1.xml"));
 
     er_filter1->run(grey, regions);
 
@@ -89,7 +89,7 @@ int  main(int argc, const char * argv[])
     t = (double)getTickCount();
 
     // Default second stage classifier
-    Ptr<ERFilter> er_filter2 = createERFilterNM2();
+    Ptr<ERFilter> er_filter2 = createERFilterNM2(loadClassifierNM2("trained_classifierNM2.xml"));
     er_filter2->run(grey, regions);
 
     t = (double)getTickCount() - t;