Removed an unused add_item method and added get_item method for retriving from the database.
Added Table Widget to MainWindow.ui
Updated MainWindow.ui Kingdom halls --> Congregations
Added columns to QTableWidget for CongregationWindow.ui
Added code so that CongregationWindow shows when clicked.
Added return_sql method to fetch table rows.
Added docstrings to the methods in class main
Started added a method to populate the table in CongregationWindow.
Improved upon pop_table(). Still not working.
Added congregation.py to handle congregation related functions
Added new dialog to enter and edit congregations.
Switched out QTableWidget for QListWidget
Replaced get_item() with return_pass_sql. The later of the two takes a SQL code and passes it to SQLite
Modified the get_list method to be simpler.

Got rid of the un-needed list variable. It served to purpose.
Few changes while implementing pop_table method for the CongregationWindow

Renamed pop_table() with populate_table(). Aslo removed the debugging code and added code that populates a list of congregation from the database into the list_congregation list.
Removed a bug.

"Return list" was added to line 117 by mistake. It was removed.
Removed 'OK' Button. It's not needed.
Added AddCongregationWindow

The AddCongregationWindow allows the user to enter a new congregation to the database.
Changed the names of various widgets.
Adding a new congregation functionality.

Added method add_item so that user can add a new congregation to the database.