Direction splitter > check for already split-ed trips

[mmathieum]

Tasks:

• new direction ID assignment different if split-ed by trip head-sign
• check Orleans Express Montreal Airport route

Check:

• mtransitapps/ca-kingston-transit-bus-android@11e40b5...2fece5b
• mtransitapps/ca-campbell-river-transit-system-bus-android@19e14a1...5611f44

[mmathieum]

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