Lua: Fix LeftX, RightX, TopY, LAND_WIDTH, LAND_HEIGHT being broken if onVisualGearAdd is set
Fixes
bug #585
Remove mail.gna.org mailing list from README.md (gna.org has shutdown for good)
Lua: Rename globals: NoPointX→NO_CURSOR, cMaxTurnTime→MAX_TURN_TIME, cMaxHogHealth→MAX_HOG_HEALTH
These globals did not exist in 0.9.24, so this change is safe.