[XeTeX] polyglossia and french

[rhino64 at postmail.ch]

Hi All,
    When typesetting documents in french with polyglossia,
a space is added before double punctuation signs (like !:?...).

This is normal in french typography used in France. However,
here in Switzerland, it is more usual to not use this
extra space.

For the Babel package, I have written few "shorthands" to remove
the unwanted space. Since such trick is no more available
in polyglossia, what is the best solution to remove
this extra space while keeping the others features related to 
the french language.

Thanks for your help,