Adding the columns necessary for initial benchmarking. This just takes LAMP's values wholesale, but in the past we've completely reworked them as well. Will make those changes in a later PR as needed.
Adding columns for (opposite of what I said on Slack) branch headways. For backwards-compatibility, the headways column will refer to trunk headways. scheduled_headway_branch and headway_branch_seconds will be null, usually, except when they're not.
Added testing for departure/arrival collation, and tweaked the merge calculations for them accordingly.
Killing a couple of birds with 1 stone here
headwayscolumn will refer to trunk headways.scheduled_headway_branchandheadway_branch_secondswill be null, usually, except when they're not.