First commit to mysql-5.0 tree to include MySQL Federated Storage Handler. This includes both the source and header files, test (results, test, require), and modifications to server and handler base files, and autoconf modifications to properly build federated handler.


configure.in:
  inclusion of federated handler autoheader macro
mysql-test/mysql-test-run.sh:
  allow usage of replication tests for federated handler
sql/Makefile.am:
  inclusion of federated header and source file
sql/field.h:
  overloaded method val_str() to work with fields in 'old_data' in 'update_row()'
sql/handler.cc:
  added code to include federated handler
sql/handler.h:
  add db type for federated
sql/mysql_priv.h:
  added code for federated handler
sql/mysqld.cc:
  added code for federated handler
sql/set_var.cc:
  added code for federated handler