buildcix.sh: add sandpit warning tp cix release message (if required).
Set download location to vienna/files or vienna/sandpit as required.
Makefile: Add a test for the DEVELOPER_DIR variable existing and that
it points to a directory. Unfortunately, xcrun and xcodebuild do not return
a retcode other than zero, even if the DEVELOPER_DIR does not exist.
Growl Extract. The the tar to extract based on SDK name. Previous
versions used Deployment Target.
Add a validate-help target to the Makefile, to validate the help
files for well-formed HTML. Fix index.html for a bug shown during validation.