OpenRA/OpenRA — pull request #2798 by bidifx (2013-03-19 17:50:25+00:00)
Title: smooth contrails

added moving average to contrails to smooth them when aircraft are circling

![ex](https://f.cloud.github.com/assets/3892421/277099/45db7460-90bd-11e2-8b0a-e0067d6b4cae.png)

Please pull :)