Restructure some header files a bit, in particular heapam.h, by removing some

unnecessary #include lines in it.  Also, move some tuple routine prototypes and
macros to htup.h, which allows removal of heapam.h inclusion from some .c
files.

For this to work, a new header file access/sysattr.h needed to be created,
initially containing attribute numbers of system columns, for pg_dump usage.

While at it, make contrib ltree, intarray and hstore header files more
consistent with our header style.

src/backend/access/nbtree/nbtinsert.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/nbtree/nbtinsert.c,v 1.165 2008/03/26 21:10:37 alvherre Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/nbtree/nbtinsert.c,v 1.166 2008/05/12 00:00:45 alvherre Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -19,6 +19,8 @@
 #include "access/nbtree.h"
 #include "access/transam.h"
 #include "miscadmin.h"
+#include "storage/bufmgr.h"
+#include "storage/lmgr.h"
 #include "utils/inval.h"
 #include "utils/tqual.h"
 

src/backend/access/nbtree/nbtpage.c

@@ -9,7 +9,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/nbtree/nbtpage.c,v 1.108 2008/03/26 18:48:59 alvherre Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/nbtree/nbtpage.c,v 1.109 2008/05/12 00:00:45 alvherre Exp $
  *
  *	NOTES
  *	   Postgres btree pages look like ordinary relation pages.	The opaque
@@ -25,6 +25,7 @@
 #include "access/nbtree.h"
 #include "access/transam.h"
 #include "miscadmin.h"
+#include "storage/bufmgr.h"
 #include "storage/freespace.h"
 #include "storage/lmgr.h"
 #include "utils/inval.h"

src/backend/access/nbtree/nbtree.c

@@ -12,7 +12,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/nbtree/nbtree.c,v 1.159 2008/04/16 23:59:39 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/nbtree/nbtree.c,v 1.160 2008/05/12 00:00:45 alvherre Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -23,6 +23,7 @@
 #include "catalog/index.h"
 #include "commands/vacuum.h"
 #include "miscadmin.h"
+#include "storage/bufmgr.h"
 #include "storage/freespace.h"
 #include "storage/ipc.h"
 #include "storage/lmgr.h"

src/backend/access/nbtree/nbtsearch.c

@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/nbtree/nbtsearch.c,v 1.116 2008/01/01 19:45:46 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/nbtree/nbtsearch.c,v 1.117 2008/05/12 00:00:45 alvherre Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -18,6 +18,7 @@
 #include "access/genam.h"
 #include "access/nbtree.h"
 #include "pgstat.h"
+#include "storage/bufmgr.h"
 #include "utils/lsyscache.h"
 
 

src/backend/access/nbtree/nbtutils.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/nbtree/nbtutils.c,v 1.89 2008/04/16 23:59:40 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/nbtree/nbtutils.c,v 1.90 2008/05/12 00:00:45 alvherre Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -22,6 +22,7 @@
 #include "access/reloptions.h"
 #include "executor/execdebug.h"
 #include "miscadmin.h"
+#include "storage/bufmgr.h"
 #include "storage/lwlock.h"
 #include "storage/shmem.h"
 #include "utils/lsyscache.h"

src/backend/access/nbtree/nbtxlog.c

@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/nbtree/nbtxlog.c,v 1.50 2008/01/01 19:45:46 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/nbtree/nbtxlog.c,v 1.51 2008/05/12 00:00:45 alvherre Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -16,6 +16,7 @@
 
 #include "access/nbtree.h"
 #include "access/transam.h"
+#include "storage/bufmgr.h"
 
 /*
  * We must keep track of expected insertions due to page splits, and apply