revforget throws away data reveal keeps in order to be able to hide
the revealed parts of the map
lair allows marking the map as monster lair (or the opposite while
using the 'reset' option)
This is an incompatible change to the plugin ABI.
The Console is not thread-safe unless used indirectly
via color_ostream_proxy, so everything should use their
per-thread stream.
Petr Mrázek
Robert Heinrich
Alexander Gavrilov