BASEL, Switzerland/LONDON (Reuters) - Global banking regulators have agreed on a proposal to slap an extra capital charge on the world's biggest banks to make them safer by 2019. (http://feeds.feedburner.com/~ff/reuters/topNews?d=yIl2AUoC8zA) (http://feeds.feedburner.com/~ff/reuters/topNews?i=Y6604axUH-o:yWRIzC-6wSw:V_sGLiPBpWU) (http://feeds.feedburner.com/~ff/reuters/topNews?i=Y6604axUH-o:yWRIzC-6wSw:-BTjWOF_DHI) (http://feeds.feedburner.com/~r/reuters/topNews/~4/Y6604axUH-o)