provide a better help and usage

tsgqc.m

-%%
 function tsgqc( varargin )
-% TSGQC: Thermosalinograph (TSG) Quality Control software
+%TSGQC Thermosalinograph (TSG) Quality Control software
+% TSGQC is a software for interactive analysis and validation of
+% underway SST / SSS (Sea Surface Temperature and Sea Surface Salinity)
+% measurements from a SeaBird Thermosalinograph (TSG). 
+% It has been developed under Matlab.
 %
-% $Id$
+% Usage:
+%   tsgqc help
+%
+% See:
+%   Documentation: http://www.ird.fr/us191/spip.php?article63
+%   Source code: https://git.outils-is.ird.fr/grelet/TSG-QC
+%
+
+% Tips:
+%  To get and check tsg structure anywhere during debug:
+%  tsg = getappdata( findobj('Tag', 'TAG_TSG-QC_GUI'), 'tsg_data')
 
 
 %% COPYRIGHT & LICENSE
-%  Copyright 2007 - IRD US191, all rights reserved.
+%  Copyright 2007-2018 - IRD US191, all rights reserved.
 %
 %  This file is part of tsgqc.
 %
@@ -23,14 +36,7 @@ function tsgqc( varargin )
 %    You should have received a copy of the GNU General Public License
 %    along with Datagui; if not, write to the Free Software
 %    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
-%
-%% DOCUMENTATION
-% see: http://www.ird.fr/us191/spip.php?article63
-% svn: https://svn.mpl.ird.fr/us191/tsg-qc/trunk/
-%
-%% TIPS
-%  To get tsg anywhere during debug:
-%  tsg = getappdata( findobj('Tag', 'TAG_TSG-QC_GUI'), 'tsg_data')
+
 
 %% Define global variables for VERSIONING
 % ---------------------------------------
@@ -42,6 +48,8 @@ global DEBUGGING
 
 % version number, may be used to initialize some files when it change
 % 0.90x -> 1.0RCx
+% if you modify the tsgqc.preference structure, you need to increment 
+% or modify the version number to load a new default structure
 % -------------------------------------------------------------------
 VERSION      = 1.485;  % -> 1.44
 CHAR_VERSION = '1.48.5RC5';