LONDON, March 6 (Reuters) - World financial markets kept on a radical readjustment course on Thursday after U.S. President Donald Trump's shakeup of the transatlantic relationship spurred a seismic, half-a-trillion-euro shift in German defence and infrastructure spending. The European Central Bank cut its interest rates again, as expected, and said monetary policy was becoming less restrictive, which traders took to mean another cut in April might not be a given - giving the euro another boost. That would normally suck up traders' attention. But it was just one of a myriad factors in play, with a global bond market selloff...