add gui/biomes: a way to see where one biome ends and another begins

changelog.txt

@@ -31,6 +31,7 @@ Template for new versions:
 - `uniform-unstick`: (reinstated) force squad members to drop items that they picked up in the wrong order so they can get everything equipped properly
 - `gui/reveal`: temporarily unhide terrain and then automatically hide it again when you're ready to unpause
 - `gui/teleport`: mouse-driven interface for selecting and teleporting units
+- `gui/biomes`: visualize and inspect biome regions on the map
 
 ## New Features
 - `uniform-unstick`: add overlay to the squad equipment screen to show a equipment conflict report and give you a one-click button to fix

docs/gui/biomes.rst

@@ -0,0 +1,17 @@
+gui/biomes
+==========
+
+.. dfhack-tool::
+    :summary: Visualize and inspect biome regions on the map.
+    :tags: fort inspection map
+
+This script shows the boundaries of the biome regions on the map.
+Hover over a biome entry in the list to get detailed info about it.
+
+
+Usage
+-----
+
+::
+
+    gui/biomes