New class MainMenu - This contains main menu buttons and a temp area for
the DTS screens (Defects List, Add New defect and Defect Detail screen).
Modified class Main - changed to JFrame, added method to display
MainMenu.
Modified class Login - changed from extending Dialog to JPanel.
Commented out code dealing with Passwords until figure out if we want a
password and also until we have a DB or other way of having valid login
users.
So far just sketches of screen layouts, all will need work to look
better.