Even by the high standards of choreographed diplomatic events, the public displays of affection on the occasion of US Treasury Secretary Janet Yellen to her Irish counterpart, Minister for Finance Paschal Donohoe, were particularly warm for two people with diverging views on global corporate tax rules until just three weeks ago.  “Even though the subject matter was difficult, the tone of our engagement on it was never difficult,” Donohoe said, adding that the approach on both sides was based on “friendship, cooperation and how to find compromise”. Yellen’s first trip to Ireland as the US’s top public finance official, following…