BayDAG Contribution #14: Increasing Larch Loading for NMTF

[dhensle]

This PR increases the loading speed of the non-mandatory tour frequency estimation data bundle into Larch from hours to a couple minutes. Essentially fixes the issue for #686, but in NMTF instead of location choice. Also adds the ability to have comments in the spec file.

Required for SANDAG ABM3 production? -- No