Fixed include error on CudaVec
Updated comments on Node.cpp
Node fixed errors on set_y_rotation_perpendicular_to_next_bone

Before the method makeRotate from osg was used to calculate the rotation.
But this could lead to wrong rotations since the rotation axis was calculated by them.
Now we force rotation axis to be along bone direction and calculate angle using
dot product.
Node fixed angle errors in set_y_rotation_perpendicular_to_next_bone

Before we always took angle as being positive. Now positive and negative are calculated
and we take the best result.
Fixed index error on fin leg positions in boneposfinder.

find_leg_lower_3_joints_simple was using length of the previous bone
instead of the current bone.
BonePosFinder added method to find leg positions using line fitting to the data.
CommonFitter refine positions methods deleted.

This methods had been moved to bonePosFinder and are no longer used in this
class or its derivates.
LegFitter included code to use BonePosFinder find_leg_lower_3_joints_line_fitting

This improved method gives in general better results than
find_leg_lower_3_joints_simple
SkeletonFitting deleted some no longer valid comments
RenderSkeletonization added method to draw lines