Tweak mdcreate a little bit so that it returns the right errno.

inputs have been converted to newstyle.  This should go a long way towards
fixing our portability problems with platforms where char and short
parameters are passed differently from int-width parameters.  Still
more to do for the Alpha port however.

whether to do fsync or not, and if so (which should be seldom) just
do the fsync immediately.  This way we need not build data structures
in md.c/fd.c for blind writes.

as a shared dirtybit for each shared buffer.  The shared dirtybit still
controls writing the buffer, but the local bit controls whether we need
to fsync the buffer's file.  This arrangement fixes a bug that allowed
some required fsyncs to be missed, and should improve performance as well.
For more info see my post of same date on pghackers.

  * Portions Copyright (c) 1996-2000, PostgreSQL, Inc

to all files copyright Regents of Berkeley.  Man, that's a lot of files.

Fewer calls to nameout.

Better use of RelationGetRelationName.

Now indexes of pg_class and pg_type are unique indexes
and guarantee the uniqueness of correponding attributes.
heap_create() was changed to take another boolean parameter
which allows to postpone the creation of disk file.
The name of rd_nonameunlinked was changed to rd_unlinked.
It is used generally(not only for noname relations) now.
Requires initdb.

insight that RelationFlushRelation ought to invoke smgrclose, and that the
way to make that work is to ensure that mdclose doesn't fail if the relation
is already closed (or unlinked, if we are looking at a DROP TABLE).  While
I was testing that, I was able to identify several problems that we had
with multiple-segment relations.  The system is now able to do initdb and
pass the regression tests with a very small segment size (I had it set to
64Kb per segment for testing).  I don't believe that ever worked before.
File descriptor leaks seem to be gone too.
I have partially addressed the concerns we had about mdtruncate(), too.
On a Win32 or NFS filesystem it is not possible to unlink a file that
another backend is holding open, so what md.c now does is to truncate
unwanted files to zero length before trying to unlink them.  The other
backends will be forced to close their open files by relation cache
invalidation --- but I think it would take considerable work to make
that happen before vacuum truncates the relation rather than after.
Leaving zero-length files lying around seems a usable compromise.

shmem_exit to replace exitpg().

After applying the following patch there remain two
probable buffer overruns detected by Electric Fence during
the regression test.
I'll try find out what causes the remain two ones.

This patch also corrects a typo in smgr.c.

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

   mdunlink() and mdclose() (too !!!) now free MdfdVec for relation
   and add it to free list, so it may be re-used for another relation
   later.
2. Fix VFD-manager memory leak (found by Massimo ... and me):
   mdunlink() has to call FileUnlink() to free allocation for fileName
   and add the Vfd slot to the free list.

Add #include "postgres.h" as required

Remove #include "c.h" *and* "utils/elog.h" as applicable