New annotated, poseable body scaffold

[rchristie]

Better general body shape with poseable human body network layout sub-scaffold.
Add annotations for body internals: abdominal/thoracic cavity boundary, diaphragm, spinal cord.
Add additional skin epidermis subsets for left/right arm/leg.
Improved tube network mesh segment sampling to complete junction transitions in finite distance from junction, handle changes in lateral size and around curves to give expected radial lines of elements.
Use scale factors on final core transition elements to handle different element density/derivative sizes through shell.

[oneway1225]

Few minor comments for you to take a look at.

[oneway1225]

Issue with converging bifurcation case not working when using 12 elements around, and 8 annotation number of elements around, with solid core on. There seems to be no issue with normal bifurcation case. This has been discussed with Richard.

[oneway1225]

Trifurcation also has an issue - 12 elements in, and 8 elements around out without core fails to generate elements properly.

[oneway1225]

There also seems to be an issue with EFT when generating normal bifurcation with a core - 12 around elements in , and 8 elements out.

[oneway1225]

A couple of very minor comments.
There is an issue with the 3D body scaffold when the leg lateral angle is greater than 50 degrees, but happy to approve if this is a non-issue.