…t superproc

… running)

- submaps are sorted in Location submenu\
- clickable links to submaps are sorted

Remove the 'HEBDO' configuration entry from the default Welcome.conf as
it isn't used since Webobs switch from the Hebdo to the Gazette.

This commit introduces new CSS classes to allow present graphs in nice
frames on the welcome page and changes the Welcome_news.txt default file
to make use of these classes.

The wpage.pl was systematically interpreting the content of files to
display as `Wiki` content, even though the first line include
`TITRE_HTML|` to indicate an HTML content. Some HTML content was thus
not correctly displayed by wpage.pl (and usually totally invisible on
the page).

…in release notes)