- ad.module

    o feature #298608: return ad_link_attributes as array so ad_display_TYPE
                   functions can call l() rather than custom building links
 - ad.install
    o feature #298608: flush all caches for new ad display functions
 - ad_external.module
    o feature #298608: display external ad with themeable function
 - ad_html.module
    o feature #298608: display html ad with themeable function
 - ad_image.module
    o feature #298608: display image ad with themeable function
 - ad_text.module
    o feature #298608: display text ad with themeable function