include/mysql.h:
  Adding an option for data truncations feature.
libmysql/libmysql.c:
  No 'smart' behaviour now for data truncations: they are always
  reported, unless switched off with 
  mysql_options(mysql, MYSQL_REPORT_DATA_TRUNCATION, (my_bool*) &(option=1));
sql-common/client.c:
  Add support for report-data-truncation variable in my.cnf
tests/client_test.c:
  A test for MYSQL_REPORT_DATA_TRUNCATION option.