Massive patch

OK, here are the details to the patch I am currently applying. It
cleans up a lot of the internal tuple access routines.

cvs update and initdb, everyone.

---------------------------------------------------------------------------

heap_fetch requires buffer pointer, must be released
heap_getnext no longer returns buffer pointer, can be gotten from scan
descriptor
bootstrap can create multi-key indexes
pg_procname index now is multi-key index
oidint2, oidint4, oidname are gone (must be removed from regression tests)
use System Cache rather than sequential scan in many places
heap_modifytuple no longer takes buffer parameter
remove unused buffer parameter in a few other functions
oid8 is not index-able

^^^

I meant to say "now indexable".

remove some use of single-character variable names
cleanup Buffer variables usage and scan descriptor looping
cleaned up allocation and freeing of tuples
18k lines of diff

-- 
Bruce Momjian                          |  830 Blythe Avenue
maillist@candle.pha.pa.us              |  Drexel Hill, Pennsylvania 19026
+  If your life is a hard drive,     |  (610) 353-9879(w)
+  Christ can be your backup.        |  (610) 853-3000(h)

-- 
Bruce Momjian                          |  830 Blythe Avenue
maillist@candle.pha.pa.us              |  Drexel Hill, Pennsylvania 19026
  +  If your life is a hard drive,     |  (610) 353-9879(w)
  +  Christ can be your backup.        |  (610) 853-3000(h)