[opensource-dev] OPEN-50 (aka STORM-1149) merged - configuration name changes

[Oz Linden (Scott Lawrence)]

I've merged the changes to support open source configurations building 
with the VS Express edition.  Many people have been using these for 
quite some time, so I don't expect any big surprises (famous last words).

Note:  This changes the configuration names from OpenSource<something> 
to <something>OS for <something>={Debug,RelWithDebInfo,Release}.

I did not take in the last change that Ima posted, which made open 
source builds disable the tests by default.   If you want to turn them 
off, you can, but it should not be the default.