Update Selected outputs for cervical spine

[divyaksh-chander]

Change orientation to measure compression and shear force at joints.
The trunk joint reaction force (C7T1 to C0C1) are now expressed in new reference nodes that are aligned with the vertebral body. These new reference nodes are created inside the lumbar joint nodes of the proximal lumbar segment.

• The selected outputs for trunk JRF are updated to use the new oriented rot nodes.
• Some documentation is added in the selected outputs file describing the interpretation of the JRF.
• Names of the selected outputs are updated from to include compression and shear force. This will break existing models and will bring this change to the attention of the users.
• Users can enable the previous outputs with a compatibility switch #define BM_COMPATIBILITY_24_TRUNK_SELECTED_OUTPUTS_JRF ON
• Names of cervical JRF in selected outputs are changed from C(x)C(x-1) to C(x-1)C(x) to be consistent with the lumbar outputs.
• Change log has been updated

[melund]

@divyaksh-chander, I have fixed the reason documentation fails to build on the master branch. I just pushing the "Update branch" button here on GitHub. That will merge the master branch in, and then test should pass.