Antibody selection about mabscape HOT 4 OPEN

I used to have one way of labelling antibodies by creating a QLabel and displaying the QLabel over an antibody, which got hidden on rotation of the view.
Now I usually press "L" to label everything, which create "Text" objects, subclass of SlipObject in helen3d, which render text to an OpenGL object and display directly in the renderer.

I don't think I ever cleaned up the QLabel thing afterwards or put it all under the same system.

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These are all a few separate issues, but for the last one: this is a good linear algebra puzzle...
(a) draw a vector from antibody to centre of antigen
(b) construct a model mat4x4 matrix which looked along this vector
(c) assign it to Experiment::_gl (I would need to make a SlipGL::setModel in helen3d to make this possible)

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7901ca8
Quality of life change:
If an antigen is clicked, all its connections stay highlighted, even when moving the mouse somewhere else.
Now it is possible to rotate the Protein and see where the connections go.

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aeebead
As written, Quality of life change, selecting antibody from list will also highlight the connections.

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