longer use this parameter any more.

autosizes everything.

We need it to build out-of-tree VSCs.

This reverts commit a1ac5e7e.

Redundant

Too many acronyms...

Since we seem to have a number of new VCL variables, there is now
a section heading for that in Upgrading.

Spottes by:	dridi

the shared memory segment could have gone away, simply
ignore the segment in that case.

Fixes #2411

about varnishlog(1).

And some whitespace cleanup.