+ * meta: Drop support for "meta link", since supporting this for internal
+ links required meta to be run during scan, which complicated its data
+ storage, since it had to clear data stored during the scan pass to avoid
+ duplicating it during the normal preprocessing pass.
+ * If you used "meta link", you should switch to either "meta openid" (for
+ openid delegations), or tags (for internal, invisible links). I assume
+ that nobody really used "meta link" for external, non-openid links, since
+ the htmlscrubber ate those. (Tell me differently and I'll consider bringing
+ back that support.)
+ * meta: Improved data storage.
+ * meta: Drop the hackish filter hook that was used to clear
+ stored data before preprocessing, this hack was ugly, and broken (cf:
+ liw's disappearing openids).
+ * aggregate: Convert filter hook to a needsbuild hook.