Fix bug #3443, better foreign key error messsages.
innobase/dict/dict0dict.c: Add 'add_newline' parameter to dict_print_info_on_foreign_key_in_create_format. innobase/include/dict0dict.h: Add 'add_newline' parameter to dict_print_info_on_foreign_key_in_create_format. innobase/include/os0file.h: Add os_file_read_string. innobase/include/trx0trx.h: Add trx_set_detailed_error and trx_set_detailed_error_from_file functions and a detailed_error field to trx_struct. innobase/include/ut0mem.h: Add ut_strlcpy. innobase/os/os0file.c: Add os_file_read_string. innobase/row/row0ins.c: Add row_ins_set_detailed function and call it when needed. Adapt to changes in dict_print_info_on_foreign_key_in_create_format. innobase/trx/trx0trx.c: Add trx_set_detailed_error and trx_set_detailed_error_from_file. Clear trx->detailed_error in trx_create. innobase/ut/ut0mem.c: Add ut_strlcpy. mysql-test/r/innodb.result: Add new tests, adapt existing ones whose output was changed. mysql-test/t/innodb.test: Add new tests, adapt existing ones whose output was changed. sql/ha_innodb.cc: Add get_error_message. Clear trx->detailed_error in start_stmt and external_lock. sql/ha_innodb.h: Add get_error_message. sql/handler.cc: Add special case code in print_error for HA_ERR_ROW_IS_REFERENCED and HA_ERR_NO_REFERENCED_ROW. Change SETMSG to point to new error messages. sql/share/errmsg.txt: Add ER_ROW_IS_REFERENCED_2 and ER_NO_REFERENCED_ROW_2.
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