fixed type ambiguity

baselib/ICETools.cpp

@@ -210,7 +210,7 @@ int ICETools::showImages ( vector<NICE::Image> & imagelist )
   int ysize = imagelist[0].height();
 
   int n = imagelist.size();
-  int n1 = ( int ) sqrt ( n );
+  int n1 = ( int ) sqrt ( (double)n );
   int n2 = n / n1 + 1;
 
   NICE::Image img ( n1*xsize, n2*ysize );