sql/filesort.cc:
  removing of some extra comments
sql/sql_class.h:
  Clear division between new and old stripping code
sql/sql_delete.cc:
  Stripping of unnecessary code and making it more efficient
sql/sql_parse.cc:
  Better split of LEX into two and enhancements in multi table delete
sql/sql_yacc.yy:
  More efficient division of LEX and optional syntax in multi - table delete
sql/uniques.cc:
  fixing some additional bugs