[development] Modules page rework

[Earl Miles]

Chris Johnson wrote:
> I cannot disagree with Morbus any more vehemently.  I've been trying to 
> get some kind of version identification feature for modules for over 2 
> years.  I waste way the hell too much time trying to remember wtf 
> version of a site and contrib modules I'm running on a site that I 
> administer from time to time. Having it all listed on the modules page 
> is fantastic and will save me lots of time and headaches in the future.  
> (And yes, we need contrib modules to have version numbers.)

I think Morbus got this one, having not quite understood it at first, 
and is basically on board with it, except perhaps for the default 
versioning of core modules.