(svn r24134) -Add: Configurable limits for tree planting.

src/saveload/afterload.cpp

@@ -2736,6 +2736,12 @@ bool AfterLoadGame()
 		}
 	}
 
+	if (IsSavegameVersionBefore(175)) {
+		/* Introduced tree planting limit. */
+		Company *c;
+		FOR_ALL_COMPANIES(c) c->tree_limit = _settings_game.construction.tree_frame_burst << 16;
+	}
+
 	/* Road stops is 'only' updating some caches */
 	AfterLoadRoadStops();
 	AfterLoadLabelMaps();

src/saveload/company_sl.cpp

@@ -289,6 +289,7 @@ static const SaveLoad _company_desc[] = {
 
 	SLE_CONDVAR(CompanyProperties, terraform_limit,       SLE_UINT32,                156, SL_MAX_VERSION),
 	SLE_CONDVAR(CompanyProperties, clear_limit,           SLE_UINT32,                156, SL_MAX_VERSION),
+	SLE_CONDVAR(CompanyProperties, tree_limit,            SLE_UINT32,                175, SL_MAX_VERSION),
 
 	SLE_END()
 };