My father would have called that title two-thirds of a pun. I will let you extrapolate that one yourselves. Ex Libris Group announced today that Robert Mercer has been appointed president of the Ex Libris Group North American subsidiary, effective immediately. Mercer was most recently a regional vice- president and general manager at SAS Institute, Inc. Mercer will replace Dan Trajman who joined Ex Libris in March 2004. Trajman will stay on in a consultative role through 2007. “I am excited to be joining such a creative, forward-looking company with a large, active customer base,” noted Mercer. “I have been …