HEADSUP: FLAVORS (initial version) and subpackages proposals

[Franco Fichtner]

> On 20 Dec 2016, at 9:42 AM, Franco Fichtner <franco at lastsummer.de> wrote:
> 
> To emphasise on this:

And lastly... if we have the automatic "default" flavour that is
defined by the OPTIONS_DEFAULT knobs, we could finally avoid pkg
upgrading custom builds by knowing that somebody built a "custom"
version of their port and that there is no equivalent to upgrade
to.

This is exciting!


Cheers,
Franco