[cmake-developers] RFC: add version to project() call

[Stephen Kelly]

Brad King wrote:

> I reverted the 'AddVersionToProjectCommand' topic from 'next'
> and replaced it with a 'project-version-variables' topic that
> adds a policy:

Should this topic set the CPACK_PROJECT_VERSION variable? Or should cpack 
first try to read PROJECT_VERSION, and only use CPACK_PROJECT_VERSION as a 
fallback? 

Thanks,

Steve.