Add a new debugging option, 'montelecontrol', that allows a wizard-
mode player to choose a teleporting monster's destination. If player
picks a bad spot, confirmation will be requested. If accepted, the
spot will be used even though the consequences could be bad; that's
on the player. If rejected, the destination will be assigned as if
no control had been attempted rather than try again.
The fuzzer isn't allowed to override a bad spot if it tries to pick
one. That would probably trigger a sanity_check warning; the fuzzer
causes impossible warnings to behave as if panic, so accepting a bad
spot would just be fuzzer suicide. It is allowed to randomly set the
option and maybe--though extremely unlikely--randomly pick a valid
controlled destination.
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