Delete and ignore output files of the tests.

tests/.gitignore

 *.log
 *.trs
 *.i
+*.h5
+*.h5_????-??-??_??:??:??
 test_*_run
 test_precision
 test_sct

tests/Makefile.am

@@ -95,4 +95,4 @@ endif
 # Remove module files, Cray's postprocessed files and hdf5 output upon make clean:
 clean-local:
 	test -z "$(FC_MODEXT)" || $(RM) *.$(FC_MODEXT)
-	$(RM) *.i *.h5
+	$(RM) *.i *.h5 *.h5_????-??-??_??:??:??