Merge pull request #75 from L2J/hotfix/clanskills

Clan skills fixed: avoid adding to list skills already learned

L2J_Server/java/com/l2jserver/gameserver/data/xml/impl/SkillTreesData.java

@@ -748,7 +748,7 @@ public final class SkillTreesData implements IXmlReader
 				final Skill oldSkill = clan.getSkills().get(skill.getSkillId());
 				if (oldSkill != null)
 				{
-					if (oldSkill.getLevel() < skill.getSkillLevel())
+					if ((oldSkill.getLevel() + 1) == skill.getSkillLevel())
 					{
 						result.add(skill);
 					}