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
fixed coredump in concat_ws
sql/item_strfunc.h
fixed coredump in concat_ws
sql/mini_client.cc
added mc_mysql_error()
sql/mini_client.h
added mc_mysql_errno()
sql/mysqlbinlog.cc
fixed bug in --postion for local files
sql/slave.cc
more verbose message on bad net reads
sql/sql_repl.cc
send errno on error in mysql_binlog_send
