BUG#48165, needed to introduce length restrictions on partitioning fields to ensure that no stack overruns occur

Fixed sql_mode issue in BUG#48164, will ignore sql_mode when generating constants, also warnings will not be tolerated

BUG#46183, added character set identifier on character constants in VALUES part for column list partitioned tables to ensure constants are handled properly according to character sets

sql/opt_range.cc:
  WL#3352 code review fixes
  
  Corrected indenting and added range_par parameter for easier reading/formatting.
sql/partition_element.h:
  WL#3352, changed formatting of copyright header
sql/sql_partition.cc:
  WL#3352, fixed indenting and changed MAX_VALUE to MAXVALUE
sql/sql_partition.h:
  WL#3352, fixed copyright header and indenting of
  function header

Moved the new errors back to the end of errmsg.txt

Updated two tests with new error message

use function prototypes from header in conjunction with K&R-style
function definitions.  The symptom is a type mismatch between
int and wchar_t.

Fixed removal of column_list keyword for VALUES part, retained for PARTITION BY RANGE/LIST COLUMN_LIST, not entirely working yet

BUG#47837, Duplicate field names were allowed in both column list partitioning and key partitioning, added check to give error in this case

BUG#47838, NULL values in ranges was dropped due to missing else part in store_tuple_to_record, added more tests

BUG#47776, Fixed character set handling, used wrong length, eventually also found that didn't need to convert to my_strnxfrm-format for column list partitioned tables, also column list partitioned tables can use multi-byte character sets in partition fields as well as where strxfrm multiplies the number of bytes in the string

BUG#47754, used number of parts instead of number of list values as end part for list partitioning in column list partitioning