BayDAG Contribution #3: CDAP estimation with joint component

[dhensle]

As part of the original BayDAG contribution, the CDAP was extended to include a joint tour component (CDAP+J). This pull request adds required code needed to create a full estimation data bundle and code to estimate the CDAP+J model. The code to fully estimate the CDAP+J is not fully finished (SANDAG decided to just re-estimate the CDAP part), but is 90% of the way there. (The only remaining part is the final building of the joint utility equations, which is in the cdap_joint_tour_utility() method.)

Required for SANDAG ABM3 production? -- No