Add routines for temporary terrain manipulation

Each terrain change specifies a desired feature, a duration (which may
be INFINITE_DURATION), a terrain change type (used for reference and
stacking at the moment), and optionally a source monster (if one is
specified, the terrain change is undone upon the monster's death)

A temporary terrain change will automatically revert to the original
underlying feature when it times out, or the source monster is killed.

There can only be one terrain change of a given type at a single
location. A new change of the same type will overwrite the old one
if it either changes the terrain to a different feature type than the
old one, or has a greater duration than remains of the old one (this
will change the associated source monster, if appropriate).

1 files changed, 1 insertions, 1 deletions

diff --git a/crawl-ref/source/mapmark.h b/crawl-ref/source/mapmark.h
index 751fcb9a74..289cc6ddbe 100644
--- a/crawl-ref/source/mapmark.h
+++ b/crawl-ref/source/mapmark.h
@@ -193,7 +193,7 @@ public:
                     dungeon_feature_type oldfeat = DNGN_FLOOR,
                     dungeon_feature_type newfeat = DNGN_FLOOR,
                     int dur = 0, terrain_change_type type = TERRAIN_CHANGE_GENERIC,
-                    int mnum = MONS_NO_MONSTER);
+                    int mnum = 0);
 
     void write (writer &) const;
     void read (reader &);