In a different era, the tempestuous weather that gripped Singapore and Malaysia this month would have been the perfect metaphor of the bilateral relationship between the two neighbours. For decades after the end of their acrimonious post-independence union in 1965, the former British colonies publicly bickered over everything; the ownership of a railway station, water supplies, rocky outcrops in the sea, airspace and even the provenance of a shared cuisine they both call their own. The…