GPS to UTC(GMT) time conversion

%GPS2UTC Convert GPS time tags to UTC(GMT) time accounting for leap seconds
% GPS2UTC(date) corrects an array of GPS dates(in any matlab format) for
% leap seconds and returns an array of UTC datenums where:
% UTC = GPS - steptime
% Currently step times are through Jan 1 2009, but need to be added below
% as they are instuted. All input dates must be later than the start of
% GPS time on Jan 6 1980 00:00:00
%
% See also UTC2GPS.