added autmake var for failing tests but only to Makefile.am (rest not generated)

test/Makefile.am

@@ -5,16 +5,20 @@ export
 TEST_LOG_DRIVER = env AM_TAP_AWK='$(AWK)' $(SHELL) \
                   $(top_srcdir)/config/tap-driver.sh
 
+# tests which should pass
 TESTS = File.test Read_grib.test Read_netcdf.test Copy_netcdf.test Cat.test Gridarea.test Detrend.test \
         Genweights.test Remap.test Select.test Spectral.test Timstat.test Vertint.test Arith.test
 
+# tests which should fail
+XFAIL_TESTS = 
+
 #        $(top_srcdir)/test/test_Remap.sh \
-#       $(top_srcdir)/test/test_info.py
-#	$(top_srcdir)/test/test_diff.py
-#	$(top_srcdir)/test/test_Arith.py
-#	$(top_srcdir)/test/test_Arithc.py
-#	$(top_srcdir)/test/test_Selvar.py
-#	$(top_srcdir)/test/test_intgridbil.py
+#        $(top_srcdir)/test/test_info.py
+#        $(top_srcdir)/test/test_diff.py
+#        $(top_srcdir)/test/test_Arith.py
+#        $(top_srcdir)/test/test_Arithc.py
+#        $(top_srcdir)/test/test_Selvar.py
+#        $(top_srcdir)/test/test_intgridbil.py
 
 #EXTRA_DIST = $(TESTS) $(top_srcdir)/test/testStreams.py