Unnecessary rotation value added for non twist bones (related with #235)

[engetudouiti]

Just to add test pose file here. my drop box seems not forgive me to set download with link.

it only include Thing bend and twist bone rotation for G8 figure.

When I apply it in blender with import pose, it add twist rotation for non twist bone = Thing bend

So there seems issue, when convert bone rotation values.

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