mysql-test/r/view.result:
  test results for rename table view1 to view2
mysql-test/t/view.test:
  tests for rename table view1 to view2
sql/share/errmsg.txt:
  added new errormessage (schema change not allowed in rename table view)
sql/sql_rename.cc:
  added support for renaming views
sql/sql_view.cc:
  added new function mysql_rename_view
sql/sql_view.h:
  added prototype mysql_rename_view