added message on all segfaults, and numeric backtrace of Linux i386
introduced a bug into ENCRYPT() to test backtrace - will clean up
before push, but need this commit locally to pull on slave repositories
to do further testing


sql/item_strfunc.cc:
  temporarily introduced coredump bug into encrypt -- will not push,
  don't worry, just need to commit locally to test if my backtrace
  magic works on non-debugging binaries
sql/mysqld.cc:
  changed SIGSEGV handler to execute on all platforms. write_core()
  invoked only if you do --core-file, but a message is printed regardless
  On i386 Linux, attempt a numeric backtrace
sql/sql_delete.cc:
  Fixed logging bug - must log before send_ok(), otherwise, we may mess
  up error code in the query event if send_ok() fails.