By Russell Myers & Jennifer Newton The Princess of Wales has admitted editing a photo of her and her children to mark Mother’s Day and issued an apology for any confusion after it was accused of being manipulated. Last night, several of the world’s biggest international photo agencies said the photograph issued yesterday of Kate and her three children to mark Mother’s Day had been “manipulated”. The Associated Press (AP) Reuters, Agence France-Presse (AFP) and Getty Images all separately issued a “kill notice” to media organisations around the globe, confirming they had each deleted the image …