Clean up white space and add some comments.
Simply user interface and synchronize the database through a sync adapter.

Update app version to 2.0.
Require ITTIA DB SQL 6.2 or later.
Require Android API version 11 (Android 3.0 or later).
Reimplement "Synchronize" menu item using a sync adapter to synchronize in the background.
Replace "Configure Replication" menu item with an account authenticator and login activity.
Assign new contacts the name "New Contact" by default.