Merge damien-katzs-computer.local:/Users/dkatz/udf50

into  damien-katzs-computer.local:/Users/dkatz/mysql-5.1-runtime


mysql-test/r/udf.result:
  Auto merged
mysql-test/t/udf.test:
  Auto merged
sql/item_func.cc:
  Auto merged
sql/udf_example.def:
  Auto merged
sql/udf_example.c:
  null merge