  The local analytic classification of irregular linear q-difference equations
(Ramis-Sauloy-Zhang) involves the classfication of filtered q-difference
modules with a prescribed associated graded module. We prove in a more general
setting the existence for this problem of a moduli scheme which is an affine
space.
  -----
  La classification analytique locale des equations aux q-differences
irregulieres se ramene a la classification de modules aux q-differences filtres
a gradue fixe. Nous degageons ici des hypotheses generales qui assurent
l'existence d'un schema de modules pour ce probleme, qui soit de plus un espace
affine.
