Added option --valgrind-mysqltest to mysql-test-run

Added flag to Field::store(longlong) to specify if value is unsigned.
This fixes bug #12750: Incorrect storage of 9999999999999999999 in DECIMAL(19, 0)
Fixed warning from valgrind in CREATE ... SELECT
Fixed double free of mysql.options if reconnect failed


mysql-test/mysql-test-run.sh:
  Added option --valgrind-mysqltest to allow one to run mysqltest with valgrind
mysql-test/r/bigint.result:
  Update results after fix for Field::store(longlong)
mysql-test/r/range.result:
  Update results after fix for Field::store(longlong)
mysql-test/r/strict.result:
  Update results after fix for Field::store(longlong)
  (This fixes some wrong results when storing things into bigint columns)
mysql-test/r/type_ranges.result:
  Update results after fix for Field::store(longlong)
mysql-test/t/bigint.test:
  Added testing for #12750: Incorrect storage of 9999999999999999999 in DECIMAL(19, 0)
mysql-test/t/innodb.test:
  Removed comments affected by this bug fix
mysql-test/t/mysqldump.test:
  Fixed result to not depend on existing config files
mysql-test/t/range.test:
  0xff numbers are now unsigned
mysql-test/t/strict.test:
  Added errors for things that previously (wrongly) succeeded
sql-common/client.c:
  Fixed double free of mysql.options if reconnect failed
sql/field.cc:
  Added flag to Field::store(longlong) to specify if value is unsigned
sql/field.h:
  Added flag to Field::store(longlong) to specify if value is unsigned
sql/field_conv.cc:
  Fixed calls to Field::store(longlong,flag)
sql/ha_ndbcluster.cc:
  Fixed calls to Field::store(longlong,flag)
sql/handler.cc:
  Fixed calls to Field::store(longlong,flag)
sql/item.cc:
  Fixed calls to Field::store(longlong,flag)
sql/item_sum.cc:
  Fixed calls to Field::store(longlong,flag)
sql/sp.cc:
  Fixed calls to Field::store(longlong,flag)
sql/sql_acl.cc:
  Fixed calls to Field::store(longlong,flag)
sql/sql_help.cc:
  Fixed calls to Field::store(longlong,flag)
sql/sql_show.cc:
  Fixed calls to Field::store(longlong,flag)
sql/sql_table.cc:
  Fixed varning from valgrind
sql/sql_udf.cc:
  Fixed calls to Field::store(longlong,flag)
sql/tztime.cc:
  Fixed calls to Field::store(longlong,flag)
sql/unireg.cc:
  Fixed calls to Field::store(longlong,flag)

sql/sql_table.cc

@@ -1712,6 +1712,7 @@ TABLE *create_table_from_items(THD *thd, HA_CREATE_INFO *create_info,
   DBUG_ENTER("create_table_from_items");
 
   tmp_table.alias= 0;
+  tmp_table.timestamp_field= 0;
   tmp_table.s= &tmp_table.share_not_to_be_used;
   tmp_table.s->db_create_options=0;
   tmp_table.s->blob_ptr_size= portable_sizeof_char_ptr;