Here is the version 0.4 that introduces (among other things) the “auto-reload” feature”:
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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. “t_concrete_wall”), the tile (as an image + sprite id), the mapped character (e.g. “X”), the layer (e.g. “terrain”, “fourniture”, “trap”), and the number of occurence in the current mapgen. In addition, the user could sort and filter any entry according to any column.