NB: Be careful with -trunk, this is a quite intrusive change.

Continue the progress on synthetic/error pages

The default "guru meditation" is now generated from the vcl_error {}
function, which can be redefined to whatever suits your taste.

Techinical:

Add new vcl_error method and make variables available in it.

Fix a bug in "error" action, where the numeric argument would not get
interpreted correctly if it came from a variable like obj.status.

Forbid "error" action in vcl_deliver since vcl_error now goes to
vcl_deliver to send the error object.

Fix test v00001 to reflect this.

Move the obj->ws/http initialization to preallocation time to avoid
duplication.

Add read-only variable req.xid (a string!)

Add default guru meditation to default vcl.

Remove cache_synthetic.c which is now unecessary.




git-svn-id: http://www.varnish-cache.org/svn/trunk@3027 d4fa192b-c00b-0410-8231-f00ffab90ce4