Alpha 13 release-483

Bug Fixes

 * Fixed adding roofs to L-shaped buildings.
 * Fixed one bug that caused hearthlings not to mine. There is still another idle mining bug though.
 * Fixed engine error when trying to attack with an invalid weapon.
 * Fixed bug where Potter Kiln smokes forever when the potter goes off to eat; thanks for debugging that, Jomaxro!
 * Fixed collision height on Potter Kiln.

Other Changes

 * Cluster trees around lakes in desert biome. Improve placement of boulders and flora.
 * Added Buy All/Sell All buttons in trading window.
 * Rayya’s Children pays less than Ascendancy at some common stores.
 * Rayya’s Children worker outfit 2 is now properly colored.
 * Rayya’s Children weaver no longer makes winter outifts.
 * Rayya’s Children hearthings now call on Rayya, not Cid, in moments of stress.