When selecting multiple nodes and creating a new one, Nuke messes up the
node trees of all dependent nodes of the selected ones.

Nuke 4.x had some issues but they have become more pronounced since 5.x.

How to see an example?

Create 3 Read nodes and connect a Grade to each one.  Now selecting only the
Read nodes create a Blur Node.
You will notice all Read nodes Grades are connected to the single Blur Node
which == Bad.

Proposed fix.

This fix still maintains the ability to work with the following example.

Two nodes are selected, a Camera and Scene Node.

Creating a ScanlineRender node will connect the proper inputs to the
selected Camera and Scene.

The proposed fix does have issues with some nodes and there
Node.optionalInput.  You will notice a badNodes var.

A new python function Node.maskInput() for retrieving a NukeWrappers mask
input would alleviate this problem.

http://pastebin.com/dVEA3sJz
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