[PATCHSET] Docs, old build files changes

Hi all

I have a set of patches that should be able to be applied without any
real concern, to:

- Better document arch settings in windows compilation;

- Document MSDTC / PGXALIB.DLL tracing

- Delete the broken and old Make.bat (and delete MakeX64.bat too, which
works but is a THIRD way to build installers - I think powershell and
installer.mak is enough). Remove docs that refer to them.

- Eliminate the copy and paste coding in the powershell installer
creation scripts. Keep the same entry points, but share common code.

- Get rid of duplicate readme_winbuild.txt

- Remove stray "execute" bits

You can pull
windows-docs-build-patches for the changes or apply the attached with
"git am" (except the execute bits one).

I found getting started with psqlODBC rather confusing, because of all
the duplicated build options, some of which were broken. This should
help a little, though it still leaves NMake and Powershell. Sounds like
that can be dealt with after the 0904 release, but this should be safe
to patch in before 0904 to make the final 0904 release a bit tidier.

Thanks!

--
Craig Ringer http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services