Changelog

1.0.1

Lighter on players' games

Countdown signs no longer pop in and out at the edge: a sign appears within SignRadius and only goes once you're 10 m further off.
Walking into a logged area makes at most 4 new signs every 2 seconds, so a clearing full of stumps doesn't add 30 objects at once.
Waits over an hour show in 5-minute steps ("about 1h 30m"), so a sign's text changes every 5 minutes instead of every minute.
New saplings carry only the settings that differ from the game's own sapling, so there's a little less for each player's game to apply when it loads one. Saplings planted by 1.0.0 keep working as before.

First release.

A stump a player removes leaves a sapling of its own tree a few seconds later.
A stump left standing turns into a sapling by itself after StumpRegrowDays in-game days.
RemoveOnFell: the stump goes as soon as its tree falls and the sapling is planted right away.
RegrowAs = Tree: a left stump comes back as the tree that stood there, the same kind and size, swamp, Mistlands and Ashlands trees too.
No saplings inside active wards or near anything a player built; PathsAndFields (off by default) keeps paths, roads and fields clear too.
ExcludeTrees: trees Regrove leaves alone.
SpecialWoodOnly: logs and stumps drop their tree's special wood (core wood, fine wood, ...) in place of plain wood.
CountdownSigns: signs beside stumps and saplings near players, with the time left (SignsOn: both, stumps or saplings).
RegrowChance: some left stumps can stay for good. MaxPerRound and RoundMinutes set how many grow back and how often.
The round's cost on the server is in the log (about 0.3 ms a frame on a world of 2.9 million objects).
Settings take effect when the file is saved, no restart.
Snowy mountain firs and autumn birches come back as plain firs and birches. A sapling only appears where it can grow.
Server only: players need nothing.