New code for locking buffer' context.

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; 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;

1. Removes the unnecessary "#define AbcRegProcedure 123"'s from
pg_proc.h.

2. Changes those #defines to use the names already defined in
fmgr.h.

3. Forces the make of fmgr.h in backend/Makefile instead of having
it
   made as a dependency in access/common/Makefile  *hack*hack*hack*

4. Rearranged the #includes to a less helter-skelter arrangement,
also
    changing <file.h> to "file.h" to signify a non-system header.

5. Removed "pg_proc.h" from files where its only purpose was for
the
   #defines removed in item #1.

6. Added "fmgr.h" to each file changed for completeness sake.

Turns out that #6 was not necessary for some files because fmgr.h
was being included in a roundabout way SIX levels deep by the first
include.

"access/genam.h"
 ->"access/relscan.h"
   ->"utils/rel.h"
     ->"access/strat.h"
       ->"access/skey.h"
	 ->"fmgr.h"

So adding fmgr.h really didn't add anything to the compile, hopefully
just made it clearer to the programmer.

S Darren.

ExecReScan for nodeAgg, nodeHash, nodeHashjoin, nodeNestloop and nodeResult.
Fixed ExecReScan for nodeMaterial.
Get rid of #ifdef INDEXSCAN_PATCH.
Get rid of ExecMarkPos and ExecRestrPos in nodeNestloop.

Add lock to i386 asm.

varchar length.

Cleans up code so attlen is always length.

Removed varchar() hack added earlier.

Will fix bug in selecting varchar() fields, and varchar() can be
variable length.

Another PGINDENT run that changes variable indenting and case label indenting.  Also static variable indenting.

Use  for 'selct .. into ..' copy of TupleDesc (without constraints)
#ifdef NOT_USED for resetVarAttrLenForCreateTable (just free tupdesc copy)

varno/varattno.