Now that we approach the time where objects have to be destroyed again,

Now that we approach the time where objects have to be destroyed again,
we need to move the data structures into the right shape.

Push hashing into cache_hash.c

Add objhead structure to hold the various hits for "Vary:" headers.

git-svn-id: svn+ssh://projects.linpro.no/svn/varnish/trunk@233 d4fa192b-c00b-0410-8231-f00ffab90ce4