move gcov files to separate directory

source/f90/Makefile

@@ -74,6 +74,9 @@ coverage: boson eels eels-boson
 	gcov usurlo
 
 	gcov eels-boson-eels-boson
+	
+	mkdir -p gcov-analysis
+	mv *.gcov gcov-analysis/
 
 clean:
 	rm -f *.o
@@ -82,7 +85,7 @@ clean:
 	rm -f *.so
 	rm -f *.gcno
 	rm -f *.gcda
-	rm -f *.gcov
+	rm -f gcov-analysis/*
 	rm -f eelsou bosou
 	rm -f bosonf90   bosonf90.exe
 	rm -f eelsf90    eelsf90.exe