Fix RCSID's

Handle more cases where a screen has not been fully initialized (inserted
into the scrq) by calling screen_fini() instead of screen_end() where
appropriate. Pointed out by chuq.

Revert all previous TAILQ_NEXT() = NULL, changes, checks against
NULL vip's and removal of screens from queues. Instead introduce
a new screen_end1() function that can be used to clean screens that
a

Revert all previous TAILQ_NEXT() = NULL, changes, checks against
NULL vip's and removal of screens from queues. Instead introduce
a new screen_end1() function that can be used to clean screens that
are not associated with queues yet. Pointed out by chuq@

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Make sure that the next pointers are NULL when we insert screens in the list.
This avoids the problem when screens are re-used that have stale pointers in
them. This was not an issue with circleq's b

Make sure that the next pointers are NULL when we insert screens in the list.
This avoids the problem when screens are re-used that have stale pointers in
them. This was not an issue with circleq's because all the pointers used to
be updated.

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- replace CIRCLEQ with TAILQ
- fix open-coded LIST code
- fix destroy screen bug (was not removed from list)

Apply our local changes.

Import nvi-1.81.6 + HEAD-2013-11-20 from git://repo.or.cz/nvi.git