New auth helper: auth_htpasswd for a hashed password stored in a file.

Use this if you for some reason can't use PAM.
Remove some message spam to stdout/stderr.
auth_pam_x11: Fix a critical bug in the unlocking code I had just pushed.

Sorry for that. After this, unlocking properly authenticates again.
Do not send keystrokes to a just started auth child.

This makes the behavior of pressing a key while the saver is running
more intuitive.