Here is the version 0.4 that introduces (among other things) the āauto-reloadā featureā:
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The idea is for the mapper (i.e. you :)) to use your own external editor.
Here is the git, the release, and the changelog.
_Fuji. What about a separate window showing the palette in a table (like Excel) and with the following columns: The symbol (e.g. āt_concrete_wallā), the tile (as an image + sprite id), the mapped character (e.g. āXā), the layer (e.g. āterrainā, āfournitureā, ātrapā), and the number of occurence in the current mapgen. In addition, the user could sort and filter any entry according to any column.