Document the marker properties connected_exclude, veto_disintegrate, veto_fragmentation, and veto_shatter, which can effect the dungeon cell a marker is on is treated by the game.
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* connected_exclude: Consider the cell to be separate from neighboring
cells with identical or similar features. Currently only useful
for preventing adjacent doors from grouping together into a gate,
forcing them to open and close as separate doors. See the Evil
Zoo (minivault_9) in dat/mini.des for an example.
* veto_disintegrate: If this property is set to "veto" then the cell
will be immune to disintegration.
* veto_fragmentation: If this proprety is set to "veto" then the cell
will be unaffected by fragmentation (Lee's Rapid Deconstruction
spell).
* veto_shatter: If this property is set to "veto" then the cell will
be unaffected by the Shatter spell.