Log Message:
-----------
vacuum.c refactoring

   . rename variables
     . cur_buffer -> dst_buffer
     . ToPage -> dst_page
     . cur_page -> dst_vacpage
   . move variable declarations into block where variable is used
   . various Asserts instead of elog(ERROR, ...)
   . extract functionality from repair_frag() into new routines
     . move_chain_tuple()
     . move_plain_tuple()
     . update_hint_bits()
   . create type ExecContext
   . add comments

Manfred Koizar

Modified Files:
--------------
    pgsql-server/src/backend/commands:
        vacuum.c (r1.280 -> r1.281)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/commands/vacuum.c.diff?r1=1.280&r2=1.281)

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