Implementation of "Different border size for each side of the image"

[Juho Vepsäläinen]

This patch implements https://blueprints.launchpad.net/phatch/+spec/different-border-size-for-each-side .

[Stani (stani)]

Hi Juho,
What a pitty. This blueprint was already assigned to Erich and he completed the action a while ago. It is phatch/actions/varborder.py The only thing which is missing is the get_relevant method, but that is one I need to implement.
Sorry for your hard work.

[Juho Vepsäläinen (bebraw)]

It's alright. I just picked it as it was really close to one other patch I had written earlier (rounding action).