Added [ThreadStatic] to table counter so that table aliases can be generated consistently in a multi thread environment.

Author: BrettMcGirr

src/NHibernate/Mapping/Table.cs

@@ -25,7 +25,9 @@ public enum SchemaAction
 	[Serializable]
 	public class Table : IRelationalModel
 	{
+        [ThreadStatic]
 		private static int tableCounter;
+
 		private readonly List<string> checkConstraints = new List<string>();
 		private readonly LinkedHashMap<string, Column> columns = new LinkedHashMap<string, Column>();
 		private readonly Dictionary<ForeignKeyKey, ForeignKey> foreignKeys = new Dictionary<ForeignKeyKey, ForeignKey>();