Added a bunch of new error codes to MySQLdb.constants.ER (complete for

MySQL-5.0).

Mapped some new error codes to DataError, which has always existed,
but never had anything mapped to it.

Cleaned set_character_set() a bit.

Added new connection option sql_mode and correspond set_sql_mode()
method.

MySQLdb/test_MySQLdb_dbapi20.py

@@ -6,7 +6,10 @@ import MySQLdb
 class test_MySQLdb(dbapi20.DatabaseAPI20Test):
     driver = MySQLdb
     connect_args = ()
-    connect_kw_args = {'db': 'test', 'read_default_file': '~/.my.cnf'}
+    connect_kw_args = dict(db='test',
+                           read_default_file='~/.my.cnf',
+                           charset='utf8',
+                           sql_mode="ANSI,STRICT_TRANS_TABLES,TRADITIONAL")
 
     def test_setoutputsize(self): pass
     def test_setoutputsize_basic(self): pass