Build 3961 library in userspace, and add enctypes

Build the 3961 library in userspace, with support for the common
kerberos enctypes des3-hmac-sha1, arcfour-hmac-md5, and aesXXX-cts-hmac-sha1-96.
Export new symbols as well, and suppress deprecated warnings.

Rename all symbols, both exported and not, with an oafs_h_ prefix
so as to reduce the chance of conflicts.

Rename heim_octet_string to avoid confusion about where things are coming
from.

Reviewed-on: http://gerrit.openafs.org/10050
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit b185c3f00d8530e4341ac4f990126f8505fce0f5)

Change-Id: Ic479f9c37f79ed8bde3e59e5acd65518773e811b
Reviewed-on: http://gerrit.openafs.org/10065
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
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.

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>
(cherry picked from commit 15b5353759984bf0942dff9c3df2959f0a59b405)

Change-Id: I0a7dabad364a298cc1905709b3cffadbb5af99a3
Reviewed-on: http://gerrit.openafs.org/10066
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>