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Before getting to the core functions of the C client, we note that they
can each generate some debug information to stderr. This
information is generally helpful, especially in diagnosing problems; you
should probably not disable it. However, a function is provided for
adjusting the amount of debug information that is printed:
* use this to turn off debug ouput.
* higher numbers are more output, 0 is none.
* incidentally, if <level> is -1, it returns the current level and
* the current level is unchanged
int player_debug_level(int level);
The default debug level is 5, which prints all messages. This
same function is used to vary the debug output from the C++ client, since
it is built on top of the C client.