Changes

* Surface mining will produce [[rock shards]] on each action that lowered the corner.* The maximum depth a rock tile may be mined to beneath water is -24 dirts below water level.* Slopes created with surface mining are limited to 3x mining skill on PvE and 1x mining skill on PvP. Be careful as its possible to surface mine a slope's steepness one mine action beyond what your skill will allow. This small mistake prevents any mining actions on top of the slope.