Planned setup.ini changes for early 2018

[Jon Turney]

On 10/01/2018 22:44, Jon Turney wrote:
> 
> * Add depends: to version descriptions
> 
> This is a version-specific list of required packages (as opposed to 
> requires:, which is per-package, and contains the union of the 
> dependencies for all versions).
> 
> I believe that historical setup versions will either ignore, or can 
> handle depends: (just containing package names, without version 
> relations) relatively sanely (see [1] et seq. for details).

On further testing, it's not safe to expose some versions of setup to 
'depends:' lines, so these will have to be called 'depends2:' or 
suchlike, so they are safely ignored.

(The dependencies of the current version are always used, not the 
version actually being installed, so it may install incorrect 
dependencies if a non-current version is installed, potentially 
resulting in a broken package.)