mysql_stmt_reset() now resets param->long_data_used
Abort if --defaults-file=path-name uses a non-existing file (Bug #3413)
Fixed problem with symlink test (bug in 4.1.2)


libmysql/libmysql.c:
  Allow one to send empty strings with mysql_stmt_send_long_data()
  mysql_stmt_reset() now resets param->long_data_used
mysys/default.c:
  Abort if --defaults-file=path-name uses a non-existing file (Bug #3413)
sql/unireg.cc:
  Fixed problem with symlink test:  .frm table was not properly deleted if handler create failed