- ad_cache_file.module

    o fix PHP E_ALL notices
 - ad_image.install
    o feature #388712: add remote_image field for remotely hosting images
 - ad_image.module
    o feature #388712: optionally allow images to be hosted remotely
      (must go to "Administer > Content management > Ads > Settings > Image ad"
       and check "Allow remote hosted images" to use this feature.)
 - ad.module
    o allow ad-type module global settings changes to be saved
 - ad_owners.module
    o allow ad-type module global settings changes to be saved