Always save full label specifications in labelfile

Instead of making the labelfile nice to read by hiding options when they
are set to the default value, explicitly save all parameters of a label
to the labelfile.
Remove digestPasswordDict method from algo classes

Since all components of dispass use the `digest` method exclusively, the
leftover `digestPasswordDict` method can be removed from both algorithm
classes.
Rename 'rm' subcommand to 'remove'