allow to select multi folder to load

closes #74 (closed)

User can use cmd/ctrl + click to select multi folders to load data or detect channels in Channel Preferences Dialog

tests/test_controller/test_processing.py

@@ -161,8 +161,7 @@ class TestLoadDataAndReadChannels(TestCase):
             self.assertIsNone(load_data('RT130', None, [q330_dir], []))
         output = f.getvalue()
         self.assertIn(
-            f"Dir {q330_dir} "
-            f"can't be read due to error: Traceback",
+            "Data can't be read due to error: Traceback",
             output
         )
         with redirect_stdout(f):
@@ -170,8 +169,7 @@ class TestLoadDataAndReadChannels(TestCase):
                 load_data(self.mseed_dtype, None, [rt130_dir], []))
         output = f.getvalue()
         self.assertIn(
-            f"Dir {rt130_dir} "
-            f"can't be read due to error: Traceback",
+            "Data can't be read due to error: Traceback",
             output
         )
 
@@ -354,10 +352,9 @@ class TestDetectDataType(TestCase):
             detect_data_type([self.dir1.name, self.dir2.name])
         self.assertEqual(
             str(context.exception),
-            f"There are more than one types of data detected:\n"
-            f"{self.dir1.name}: [RT130, _]\n"
-            f"{self.dir2.name}: [Q330, VEP]\n\n"
-            f"Please have only data that related to each other.")
+            "There are more than one types of data detected:\n"
+            "Q330, RT130\n\n"
+            "Please have only one data type for each loading.")
 
     def test_unknown_data_type(self):
         """