Over-constrained components' azimuths are not overridden

[SeanDS]

If a component is linked in such a way that it is overconstrained, the link length and azimuth is changed to the required numbers but the component's azimuth is not. This leads to funky situations like this:

Notice how one mirror in each cavity is at the wrong angle.

Example to reproduce:

"""
Speedmeter example.
"""

import sys

sys.path.append('..')

import optivis.scene as scene
import optivis.bench.links as links
import optivis.bench.components as components
import optivis.bench.labels as labels
import optivis.view.canvas as canvas
import optivis.geometry as geometry

scene = scene.Scene(title="ERC Speedmeter")

laser = components.Laser(name="Laser")
eom = components.ElectroopticModulator(name="EOM")
m6 = components.BeamSplitter(name="M6")
m9 = components.CavityMirror(name="M9")
m1a = components.BeamSplitter(name="M1a", aoi=-45)
m1b = components.BeamSplitter(name="M1b", aoi=45)
m2a = components.BeamSplitter(name="M2a")
m2b = components.BeamSplitter(name="M2b")
m3a = components.BeamSplitter(name="M3a", aoi=12)
m3b = components.BeamSplitter(name="M3b", aoi=-12)

BHDa = components.Photodiode(name="BHDa")

PDHa = components.Photodiode(name="PDHa")
PDHb = components.Photodiode(name="PDHb")

# laser -> eom -> M6
scene.link(outputNode=laser.getOutputNode('out'), inputNode=eom.getInputNode('bk'), length=30)
scene.link(outputNode=eom.getOutputNode('fr'), inputNode=m6.getInputNode('frA'), length=50)

# M6 -> cavity A
scene.link(outputNode=m6.getOutputNode('bkA'), inputNode=m1a.getInputNode('bkA'), length=50)
scene.link(outputNode=m1a.getOutputNode('frA'), inputNode=m3a.getInputNode('frB'), length=100)
scene.link(outputNode=m3a.getOutputNode('frB'), inputNode=m2a.getInputNode('frB'), length=109)
scene.link(outputNode=m2a.getOutputNode('frB'), inputNode=m1a.getInputNode('frA'), length=30) # length ignored

# M6 -> cavity B
scene.link(outputNode=m6.getOutputNode('frA'), inputNode=m1b.getInputNode('bkA'), length=50)
scene.link(outputNode=m1b.getOutputNode('frA'), inputNode=m3b.getInputNode('frB'), length=100)
scene.link(outputNode=m3b.getOutputNode('frB'), inputNode=m2b.getInputNode('frB'), length=109)
scene.link(outputNode=m2b.getOutputNode('frB'), inputNode=m1b.getInputNode('frA'), length=30)

# Show
gui = canvas.Full(scene=scene)
gui.show()