Implement dialog to add/edit a single channel in database

#69 (closed)

Implement a dialog to add/edit a single channel and a dialog to edit parameter that is call from the channel dialog

• Currently using QLineEdit for display/editing ValueColor. Later, a custom widget will be developed to have better display and easier editing.
• Parameter 'Default' is only display for the channel that has no record in DB but won't be allow to select or save or call para dialog to edit.

For testing add/edit single channel, run sohstationviewer/view/db_config/add_edit_single_channel_dialog.py and change the example lines in main

For testing edit single param, run sohstationviewer/view/db_config/add_edit_single_channel_dialog.py and change the example lines in main; or press on button 'EDIT PARAMETER' of the above dialog.

sohstationviewer/database/extract_data.py

@@ -162,10 +162,11 @@ def get_color_ranges():
     return range_names, all_square_counts, clr_labels
 
 
-def create_assign_string_for_db_query(col, val):
+def create_assign_string_for_db_query(col: str, val: str) -> str:
     """
-    Create assign db string that assign to NULL if val is empty str
-    :param col: column in the db table
+    Create assign db string that assign value in single quote signs if val is
+    a string or to NULL if val is empty str
+    :param col: column name in the db table
     :param val: value to be assigned to the column
     :return: the assign db string
     """