Divided functionality into classes, fixed comments +
various other cleanup. BackenAuth no longer increments
sequence on sending password. SQLite busy timeout shortened
to 1 second.
This includes the client and backend authenticators. Currently,
only a simple password-based scheme with the SQL-client "dialog" plugin
is supported. In this mode, the server sends the first PAM message
with the AuthSwitchRequest packet and the client responds with the
password. No further authentication messages are supported. If the
connection is not encrypted, the password is sent in plaintext. The
client password is used as is for logging in to backends.
