Adds the following url rewrite keywors to the dynamic albums (updates, popular, random):
%albumId% - replaces the g2_albumId=X with the X
%page% - replaces the g2_page=X with with the X
so can have urls like
n.b file contains paths which are relative to the root of the gallery.
Updates both the dynamicalbum module and the rewrite module.
Also submitted to http://reviews.gallery2.org/ as Review 545.