Fix: Make sea level locks aware of neighbouring canals#238
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Fix: Make sea level locks aware of neighbouring canals#238
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Canal locks checked for elevation, to use alternate graphics with mini-lighthouses and breaking waves when at sea level. This looked odd when building locks on sea level land.
Therefore, add a

canal_dikecheck, to check if canal walls would be built for that tile as a half-decent proxy for checking for neighbouring land tiles. Compare the top two locks in the example image.(mostly) Fixes #237
Corner cases are when the lock is surrounded by sea level locks or rivers. Com[are the bottom two locks in the example image.