tgstation/-tg-station — pull request #5735 by phil235 (2014-11-07 18:25:45+00:00)
Title: Moving carbon/middleclickon() form carbon.dm to click.dm 

and centralising it (there was two carbon/middleclickon() proc.
Moving carbon/altclickon() to click.dm as well.

This should be able to fix #5606 .