- adserve.php

    o removed groups (replaced by taxonomy tids)
 - ad_cache_file.module
    o remove groups cache
    o include in cache ads that aren't assigned to a taxonomy
 - ad_cache_file.inc
    o remove references to group cache
    o check for ads that are not assigned to a taxonomy
 - ad.module
    o replace custom groups code with taxonomy functions
 - ad_embed.module
    o use tids instead of group name
 - ad_notify.module
    o remove references to group
 - ad_remote.module
    o use taxonomy tids rather than group name when building remote snippet
 - ad.install
    o convert ad_group table entries to taxonomy
    o remove ad_group table
    o remove gid calumn from ads table
 - ad_views.inc
    o remove most groups logic
    o update group blocks to use taxonomy