Add changes 4.0.0TP1->TP2
Revert "Ensure present dependency on vsc_fields.h"

The dependency is defined as part of vsc2rst_SOURCES.
This reverts commit b1b777d.
obj.lastuse has been renamed to obj.last_use

Update vcl(7) and default.vcl
Remove comment that never should have been commited
Import fresh devicedetect.vcl
Remove Zope/Plone example VCL

We don't have a maintainer for this, and it hasn't been updated for a while.

In general we use the Wiki for linking to or referencing backend-specific
configuration.
Forgotten references to (deleted) zope-plone.vcl

Initial commit in b0d9950.

Thanks to Federico Schwindt for pointing this out.