Understand dagger as dagger
No digging in not-placed rooms

For instance, in dreams, arenas and the maze.
Sleep tweaks

* Probability of a monster starting out asleep is now 3% rather than 5%.
* For Malygris only 1%. For Nameless Horror, never.
* Added extra message when waking up to clarify that it's because of the
tension.
* People now tend to wake up when there's combat going on around them.