Don't crash when the user cancels an add password operation.
Don't crash when the user cancels an update password operation either.
Embed the scrypt salt in the password database.

This breaks existing database files.
Turn up the scrypt parameters a little.
Turn the warnings up to 11.
Clean up warnings.
Put Change password before Delete password in password manager context menu.
Allow renaming of accounts from the edit password dialog.
Clear the clipboard 30 seconds after copying a password.
Thread-proof update and rename operations.
We need threefish-0.2.4.