Add code to do the right "backwards" merge of IMS responses.
Add link to the man page
First stab at director documentation
remove the vcl vars from the index.
it is included in the vcl man page
req.backend is gone now. req.backend_hint is it.
Reuse the same beresp->obj function for both cond and normal fetches.
Make ESI a separate chapter
Move the content from cookies and vary into increasing perf
Update index, remove orphans, add esi
rebreak lines
remove orphans - content absorbed elsewhere
Duplicate.
Correct spelling
Don't expose certain variables in vcl_pipe

Accessing bereq.first_byte_timeout and bereq.between_bytes_timeout
in vcl_pipe makes no sense so disallow it.

Fixes: #1435