foo-snapshot / foo-diff convenience functions

[Lawrence Velázquez]

> On Oct 20, 2016, at 3:34 PM, René J.V. Bertin <rjvbertin at gmail.com> wrote:
> 
> On Thursday October 20 2016 10:42:09 Lawrence Velázquez wrote:
> 
>> It is already possible to create options that enable/disable portgroup
>> behavior after the portgroup is included. The python-1.0 and php-1.1 do
> 
> Which increases the implementation complexity of the portgroup - each portgroup that needs to resort to that kind of trick.

Better that than increasing the complexity of base and portfiles.

vq