add comment for updating empty ids for TCV usage on lacs

matlab/TCV_IMAS/idses_empty_to_mfile.m

@@ -9,6 +9,16 @@ function [empty_dir_out,ids_empty_structures,okflags] = idses_empty_to_mfile(dir
 %
 % varargin{1}: option for outputs: 1 (default) to mfiles, 2 to mfiles and json files, 3 to json files
 %
+% The procedure for updating the empty idses available for TCV/lacs is to do:
+% [empty_dir_out,ids_empty_structures,okflags] = idses_empty_to_mfile;
+% !cp -pr /tmp/$USER/idses_empty_to_mfile/* /.../gdat/matlab/TCV_IMAS/ids_empty
+% !ls -alt /.../gdat/matlab/TCV_IMAS/ids_empty
+% and rm the old files (not replaced by the cp above, since it means non existent in current version
+% add branch to gdat and merge, then deploy
+%
+% wall = ids_empty_wall; % for example gives the IDS wall structure
+% help ids_empty_wall % gives you the IMAS version it used to produce it
+%
 
 if nargin < 1 || isempty(dirname_for_files) || ~exist(dirname_for_files,'dir')
   dirname_for_files = sprintf('/tmp/%s/idses_empty_to_mfile',getenv('USER'));