[cmake-developers] Add command line options for deprecation message control

[Stephen Kelly]

Michael Scott wrote:

> If there are any problems with the proposed changes let me know.

Hi Michael,

Thanks for working on this topic over such a long time period to get it 
right.

I closed 

 http://public.kitware.com/Bug/view.php?id=15677

and 

 http://public.kitware.com/Bug/view.php?id=14669

on your behalf because I couldn't assign the bugs to you in mantis.

Thanks,

Steve.