MuMech/MechJeb2 — pull request #156 by sarbian (2013-07-01 17:13:09+00:00)
Title: Add a substract button to the NodeEditor

Edit to the NodeEditor, as requested by a user on the forum, and it makes sense.
Remove the Add button
Add a - button to the left of the box and a + to the right.

Really complex stuff :)