Purpose
=======
This module allows to update the help of a module, based
on a set of .sci files.
It is a tool built on top of the help_from_sci function.
Features
========
The main function is :
* helptbx_helpupdate(funarray,helpdir,macrosdir)
* helptbx_helpupdate(funarray,helpdir,macrosdir,demosdir,modulename)
* helptbx_helpupdate(funarray,helpdir,macrosdir,demosdir,modulename,verbose)
which automatically updates the .xml help pages of a module if required,
and updates the Demo gateway if required.
