added prtUtilSplitLegend.m
added prtUtilSplitLegend.m

covartech/PRT,jpalves/PRT,jpalves/PRT,covartech/PRT,covartech/PRT,covartech/PRT,jpalves/PRT,covartech/PRT,jpalves/PRT,jpalves/PRT,jpalves/PRT,covartech/PRT