Part 2. Function QUOTE() was not multi-byte safe.

  @ mysql-test/r/ctype_ucs.result
  @ mysql-test/t/ctype_ucs.test
  Adding tests

  @ sql/item_strfunc.cc
  Fixing Item_func_quote::val_str to be multi-byte safe.

  @ sql/item_strfunc.h
  Multiple size needed for quote characters to mbmaxlen