New class Item_func_set_collation()
Fixed that "SELECT CONVERT(expr USING charset) GROUP BY 1" was not working
New COLLATION syntax:  <expr> COLLATE latin1 


mysql-test/r/ctype_many.result:
  New test slot has been added
mysql-test/t/ctype_many.test:
  New test slot has been added
sql/item_strfunc.cc:
  "SELECT CONVERT(expr USING another_charset) GROUP BY 1"  was not working as expected
  New Item_func_set_collation class
sql/item_strfunc.h:
  "SELECT CONVERT(expr USING another_charset) GROUP BY 1"  was not working as expected
  New Item_func_set_collation class
sql/lex.h:
  New keyword
sql/sql_yacc.yy:
  Stupid bug fixes
  COLLATION syntax