Tail bugs

General
1. Tails keep changing, but start at a fixed position
2. NEW: PlasmaTail, dustTail sPainter's are the same, such that dustTail's color and vertex arrays are the same.

Plasma Tail (blue)
1. One tail that starts from bottom left corner of the screen to wherever last clicked. Rotates too.
2. If in SkyDrawer::postDraw3dModel(), no "if(cometNoHalo) do_nothing;", then no plasma tails drawn except

Dust Tail (brown)
1. Line loop that outlines the plasma tail