Signal processing: Fix noise_method type, noise_value update and refacto.

Model/create_table_for_save_as.py

@@ -45,7 +45,7 @@ class CreateTableForSaveAs:
           ABS_name STRING,
           path_BS_noise_data STRING,
           filename_BS_noise_data STRING,
-          noise_method FLOAT,
+          noise_method INTERGER,
           noise_value FLOAT,
           data_preprocessed STRING
         )