% Purpose
%    deletes a global attribute.
%
% Synopsis
%    mexeps('delatt',attname)
%
% Description
%    It deletes a global attribute when file is opened for writing
%    or for editing.
%
% Examples
%    Delete a global attribute with name 'start_time'.
%
%      mexeps('delatt','start_time');
%
% See Also
%    getattnum, attname, getattval, putattval
%