Map chair skill + Hired Merchant fix

Changed map chair bonus healing mechanic to be a player skill, instead of promptly available for all players (healing buff takes place only if the player has the skill). Hired Merchant now properly checks for a space on the inventory before permitting a player to buy an item/bundle. Minor fix with concurrency on MapleStorage.

src/client/MapleClient.java

@@ -1316,7 +1316,6 @@ public class MapleClient {
                 player.cancelBuffExpireTask();
                 player.cancelDiseaseExpireTask();
                 player.cancelSkillCooldownTask();
-                player.stopChairTask();
 		//Cancelling magicdoor? Nope
 		//Cancelling mounts? Noty
 		if (player.getBuffedValue(MapleBuffStat.PUPPET) != null) {