Adds support for column reordering in pg_dump

Tested in postgresql 8.3.5

To compile: 
 -  patch/replace pg_dump.c 
 -  place reorder.c in  the same directory  
 
To run: use the -r/--reorder-columns 

Format of the file that specifies the new ordering: 
  One full qualified column-name per line, format  "schema.tablename.colname" 
  (accepts comments beginning with # , discards blanks, ignores blank lines, rejects non-ascii chars)
  Only required are the columns to be reordered, the omitted columns will be placed after the specified ones.

  Example: see atrjobs.lst  
  
  Hint: The following query produces all the original columns of the db in the desired format (uncoment to get the type as a comment)
   
   SELECT namesp.nspname || '.' || t.relname || '.' || atr.attname
      -- || ' # ' || atr_type.typname  -- optional
    FROM pg_attribute atr,  pg_class t, pg_type atr_type, pg_namespace namesp
    WHERE  atr.attnum>0 and atr.attisdropped = 'f' and atr.attrelid = t.oid 
    and atr.atttypid = atr_type.oid and t.relnamespace = namesp.oid and t.relkind = 'r' 
    and namesp.nspname not like 'pg_%' and namesp.nspname != 'information_schema'
    ORDER BY namesp.nspname,t.relname,atr.attnum 


Hernan J. Gonzalez
nov 2008
hgonzalez@gmail.com