Fixed various bugs.
Specifically: 1. `make install` now creates an empty, world-readable scorefile. 2. Moving while confused was triggering an assertion failure by sometimes indexing past the array of allowed directions. 3. End-of-game codes were overlapping with monster IDs, resulting in some incorrect game endings. In particular, getting killed by a Demon Prince would win the game. 4. Some code was still using the system `assert` rather than the internal one and these remained when building for production. They also exit without first restoring the original TTY settings.
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