Add one more stops ordering check

[alexey-zakharenkov]

The validator should check that stops (possibly projected) that are part of the rails in a route follow the rails in correct order. This is more robust approach then 'A-B-C' angle in case when rails are sorted or mostly sorted.

[alexey-zakharenkov]

Without this check the validator doesn't detect such erroneous route topologies (Fortaleza, Brazil):

[alexey-zakharenkov]

Resolved in PR #99