auto-generated via configure

individual functions in individual files

Makefile.global.

End result, if all goes well, should allow for much easier porting, since
there will no longer be a concept of a "port".  Most, if not everything,
*should* be determined by configure, or by the compiler itself.  Still
work to be done though :)

Define an "ISO-style" timespan output format with "hh:mm:ss" fields.
 Enabled by DateStyle = USE_ISO_DATES.

tree "non-PORTNAME" dependent.  Technically, anything that is PORTNAME
dependent should be able to be derived at compile time, through configure
or through gcc

async.c: #include <port-protos.h> surrounded by an #ifdef HAVE_STRDUP

vacuum.c: #include <port-protos.h> commented out...can someone comment as
          to why it was included, as it doesn't seem to have any effect
          under FreeBSD so far...would like some sort of #ifdef wrapper
          like async.c if possible

	Essentially, this cleans things up so that if PORTNAME isn't defined (I'm
    working on getting rid of it for FreeBSD, at least, to see if its possible)
    none of the PORTNAME related stuff gets passed around.

	Had a little bit of -I related redundancy as well

 date/time formats and conventions.

Remove declarations in builtins.h duplicated in dt.h.
Change a few return type declarations to use "type *"
 rather than "struct ...".

 Formerly allowed only single arguments.
Declare column constraints using the usual list mechanism rather
 than explicit itemized lists.
Remove NOTNULL from default clause syntax (retain "NOT NULL").
 NOTNULL is not SQL92; eventually remove it from expressions too?
Move ISNULL, NOTNULL to Postgres-specific token declarations.
Fix up tabs and indenting on new CREATE USER commands.

	...malloc/free -> palloc/pfree
	...fopen/fclose -> AllocateFile/FreeFile

Check for duplicate implicit index names and generate unique names.

 Most other messages do not have one.

Add code to set DATADIR in postmaster.c if -D is used