Atmos mainline pipe code moved and enabled.

Bringing in the mains pipeline! Three pipes in a single tile that run their own separate pipenetwork so you no longer need a 2-wide passageway to have scrubbers and distro running side by side!

 Old mostly completed code relocated to the appropriate folder and adjusted to reach functionality. Icons have been tweaked to re-align caps and north/west bend simple pipes, which can be seen in the (outdated) image below. 

http://i.imgur.com/4aBImRq.png

The valves, which have been disabled, do not work, but after testing numerous bends, manifolds, twists and turns, all of the other pipes work appropriately.