MsSql2000Dialect.cs: Add support for the power() function. NH-3553.

Author: oskarb

src/NHibernate/Dialect/MsSql2000Dialect.cs

@@ -110,6 +110,8 @@ protected virtual void RegisterFunctions()
 			RegisterFunction("floor", new StandardSQLFunction("floor"));
 			RegisterFunction("round", new StandardSQLFunction("round"));
 
+			RegisterFunction("power", new StandardSQLFunction("power", NHibernateUtil.Double));
+
 			RegisterFunction("acos", new StandardSQLFunction("acos", NHibernateUtil.Double));
 			RegisterFunction("asin", new StandardSQLFunction("asin", NHibernateUtil.Double));
 			RegisterFunction("atan", new StandardSQLFunction("atan", NHibernateUtil.Double));