from Tom.

output to the same file, because it is impossible.

Also set user name for pg_dumpall in pg_upgrade.

Ruprecht on Mac (64 bit).

than in a subdirectory of the $HOME directory, or $TMP in Windows.

Modify path separators for Win32.

Per ideas from Takahiro Itagaki

EDB must maintain their own patch set for this.

* There is no chmod() on Windows.
* Must always use the 3-parameter version of open()
* There is no dynloader.h - but it also appears unnecessary on all platforms
* Don't include shlobj.h because it causes compile errors, and from what I can
  see it's not actually used. This may need to be added back for mingw
  and/or cygwin in the worst case.

cmp parameter for pg_scandir().  The code failed to support this anyway
for Sun/Windows, so pretending we could accept a parameter other than
NULL was just asking for trouble.

Add documentation.

Supports migration from PG 8.3 and 8.4.