restructure timetable to allow supporting multiple departures (over a year?)

[MoKob]

Updates cyclic dependency handling:

• instead of using transfers to split cyclic routes, we re-map stops and connect them via stations. This way we can correctly handle cyclic trips, that don't start over

[codecov-io]

Codecov Report

Merging #174 into master will decrease coverage by 0.16%. The diff coverage is 92.33%.

@@            Coverage Diff            @@
##           master    #174      +/-   ##
=========================================
- Coverage   94.87%   94.7%   -0.17%     
=========================================
  Files         138     131       -7     
  Lines        3392    3398       +6     
  Branches      307     308       +1     
=========================================
  Hits         3218    3218              
+ Misses         33      32       -1     
- Partials      141     148       +7