Law firm combinations jumped 47 percent last year, and the deals mostly involved small firms joining forces with much bigger ones, a report released Wednesday says. The 88 combinations represent the highest total in the seven years that Altman Weil Inc. has compiled such data. And 51 of those deals featured a law firm combining with one at least 10 times larger than it. “The surge in 2013 numbers was driven by a boom in acquisitions of small law firms,” Altman Weil principal Ward Bower said in a statement. …