Launchpad fixes, details follow.

-- index descriptor was not setting index row length causing opt assertion failure.
        LP 1351476

-- purgedata on index supported. LP 1354108

-- An update stmt that was causing failure if index maintenance was being used.
     LP 1353116

-- new clause ‘not serialized’ has been added to force columns to not be serialized even
  if serialization is set to ON as the default.
 Used by metadata table definitions as its columns are not serialized.

Change-Id: I3b10616823fd36af199e742c4ccd58d8656c5eba
Merge "Launchpad fixes, details follow."