- updated mysql-copyright-2 to properly convert this new header from GPL to commercial for the
  commercial distribution


Build-tools/mysql-copyright-2:
  - added functionality to replace a copyright header in .sql files, too (needed for updating
    scripts/fill_help_tables.sql in the commercial source distribution)
scripts/fill_help_tables.sh:
  - added copyright header on top of the fill_help_tables.sql file (BUG#5772)