Avoid using hidden folders (issue #8).

mpwt/multipwt.py

@@ -53,7 +53,7 @@ def check_input_and_existing_pgdb(run_ids, input_folder, output_folder, verbose=
     Check if PGDBs are already in ptools-local folder.
     """
     # Check if there are files/folders inside the input folder.
-    species_folders = [species_folder for species_folder in os.listdir(input_folder)]
+    species_folders = [species_folder for species_folder in os.listdir(input_folder) if '.' not in species_folder]
     if len(species_folders) == 0:
         print("No folder containing genbank/gff file. In " + input_folder + " you must have sub-folders containing Genbank/GFF file.")
         return None