Update windows build documentation

Mention Win7 in a few more places, and talk about VS 2010/2012.
I've had the best results with VS 2005, though.

Update dead URLs.

The old version of WiX 2.0 no longer seems available (at least not from
the listed URL); replace it with

Remove coverage of NSIS installers.

Update example OpenAFS version to 1.7.25.

De-emphasize VS 2003.

Update some ntbuild.bat settings and comments to be more useful and valid.

Change-Id: Iee305833e6d2b01dd7995a78863327682fe5a8eb
Reviewed-on: http://gerrit.openafs.org/10029
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Tested-by: Jeffrey Altman <jaltman@your-file-system.com>
Diagnose calling compile_et -v without another argument

Output an error message instead of crashing with a segmentation
fault due to a NULL pointer dereference.

Bug found by Mayhem and reported by Alexandre Rebert.

Change-Id: I484f76411ed6899ea9af81256c1d392a84830d16
Reviewed-on: http://gerrit.openafs.org/10024
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Windows: Protect all Mm and Cc calls with try..except

Wrap all Memory Manager and Cache Manager operations in a try..except
block to protect against leaking the SectionObjectResource if an exception
is thrown.  Failure to release the SectionObjectResource will result in
subsequent deadlocks.

Change-Id: I92096c1d4bfd5a23069bcc364b68b07327d662ae
Reviewed-on: http://gerrit.openafs.org/10039
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Tested-by: Jeffrey Altman <jaltman@your-file-system.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Windows: validate pointer consistency

When cm_ValidateCache() is executed validate pointers to ensure
that they are in the valid range for the class of pointer.

Change-Id: I151489010430919999af85843079f81143359739
Reviewed-on: http://gerrit.openafs.org/10040
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Tested-by: Jeffrey Altman <jaltman@your-file-system.com>